ASTM D5579-19e1

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
´1
Designation: D5579 − 19
Standard Test Method for
Evaluating the Thermal Stability of Manual Transmission
Lubricants in a Cyclic Durability Test
This standard is issued under the fixed designation D5579; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
ε NOTE—Editorially updated TMC governance information in June 2022.
INTRODUCTION
Portions of this test method are written for use by laboratories that make use of ASTM Test
2,3
Monitoring Center (TMC) services (see Annex A1 – Annex A4).
TheTMC provides reference oils, and engineering and statistical services to laboratories that desire
to produce test results that are statistically similar to those produced by laboratories previously
calibrated by the TMC.
In general, the test purchaser decides if a calibrated test stand is to be used. Organizations such as
theAmerican Chemistry Council require that a laboratory utilize theTMC services as part of their test
registration process. In addition, the American Petroleum Institute and the Gear Lubricant Review
Committee of the Lubricant Review Institute (SAE International) require that a laboratory use the
TMC services in seeking qualification of oils against their specifications.
The advantage of using the TMC services to calibrate test stands is that the test laboratory (and
hence the test purchaser) has an assurance that the test stand was operating at the proper level of test
severity. It should also be borne in mind that results obtained in a non-calibrated test stand may not
be the same as those obtained in a test stand participating in the ASTM TMC services process.
ASTM International policy is to encourage the development of test procedures based on generic
equipment. It is recognized that there are occasions where critical/sole-source equipment has been
approved by the technical committee (surveillance panel/task force) and is required by the test
procedure. The technical committee that oversees the test procedure is encouraged to clearly identify
if the part is considered critical in the test procedure. If a part is deemed to be critical, ASTM
encourages alternative suppliers to be given the opportunity for consideration of supplying the critical
part/component providing they meet the approval process set forth by the technical committee.
An alternative supplier can start the process by initiating contact with the technical committee
(current chairs shown on ASTM TMC website). The supplier should advise on the details of the part
that is intended to be supplied. The technical committee will review the request and determine
feasibility of an alternative supplier for the requested replacement critical part. In the event that a
replacement critical part has been identified and proven equivalent the sole-source supplier footnote
shall be removed from the test procedure.
This test method is under the jurisdiction of ASTM Committee D02 on
Petroleum Products, Liquid Fuels, and Lubricants and is the direct responsibility of
Subcommittee D02.B0.03 on Automotive Gear Lubricants & Fluids.
Current edition approved May 1, 2019. Published June 2019. Originally Until the next revision of this test method, the ASTM Test Monitoring Center
approved in 1994. Last previous edition approved in 2016 as D5579 – 16. DOI: will update changes in the test method by means of information letters. Information
10.1520/D5579-19E01. letters may be obtained from the ASTM Test Monitoring Center, 203 Armstrong
ASTM Test Monitoring Center, 203 Armstrong Drive, Freeport, PA 16229, Drive, Freeport, PA 16229, http://www.astmtmc.org. Attention: Director. This
http://www.astmtmc.org. edition incorporates revisions in all information Letters through 18-1.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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D5579 − 19
1. Scope*
Section
Shifter Fork Wear 12.2
1.1 Thistestmethodcoversthethermalstabilityoffluidsfor
Test Validity Determination 12.3
Report 13
use in heavy duty manual transmissions when operated at high
Precision and Bias 14
temperatures.
Keywords 15
Test Validity Calculations and Limits Annex A5
1.2 The lubricant performance is measured by the number
HTCT Test Report Forms and Data Dictionary Annex A6
of shifting cycles that can be performed without failure of
Manual Transmission Cyclic Durability Test Parts Annex A7
Inspection and Wear Measurements
synchronization when the transmission is operated while con-
tinuously cycling between high and low range.
1.8 This international standard was developed in accor-
dance with internationally recognized principles on standard-
1.3 Correlation of test results with truck transmission ser-
ization established in the Decision on Principles for the
vicehasnotbeenestablished.However,theprocedurehasbeen
Development of International Standards, Guides and Recom-
shown to appropriately separate two transmission lubricants,
mendations issued by the World Trade Organization Technical
which have shown satisfactory and unsatisfactory field perfor-
Barriers to Trade (TBT) Committee.
mance in the trucks of one manufacturer.
1.4 Changes in this test method may be necessary due to
2. Referenced Documents
refinements in the procedure, obsolescence of parts, or
2.1 ASTM Standards:
reagents, and so forth. These changes will be incorporated by
D235 Specification for Mineral Spirits (Petroleum Spirits)
Information Letters issued by the ASTM Test Monitoring
(Hydrocarbon Dry Cleaning Solvent)
Center (TMC). The test method will be revised to show the
D7422 Test Method for Evaluation of Diesel Engine Oils in
content of all the letters, as issued.
T-12 Exhaust Gas Recirculation Diesel Engine
1.5 The values stated in inch-pound units are to be regarded
E29 Practice for Using Significant Digits in Test Data to
as standard. The values given in parentheses are mathematical Determine Conformance with Specifications
conversions to SI units that are provided for information only
2.2 SAE Standard:
and are not considered standard.
SAE J308 Axle and Manual Transmission Lubricants
1.5.1 Exception—When materials, products, or equipment
2.3 Military Standard:
are available only in inch-pound units, SI units are omitted.
MIL-L-2105 Lubricating Oil, Gear, Multipurpose
1.6 This standard does not purport to address all of the
2.4 Other Standard:
safety concerns, if any, associated with its use. It is the
GO-H Mack Trucks Oil,Gear: Multi-Purpose
responsibility of the user of this standard to establish appro-
priate safety, health, and environmental practices and deter-
3. Terminology
mine the applicability of regulatory limitations prior to use.
3.1 Definitions:
1.7 This test method is arranged as follows:
3.1.1 wear, n—the loss of material from a surface, generally
Section
occurring between two surfaces in relative motion, and result-
Scope 1
ing from mechanical or chemical action or a combination of
Referenced Documents 2
Terminology 3 both. D7422
Summary of Test Method 4
3.2 Definitions of Terms Specific to This Standard:
Significance and Use 5
Apparatus 6
3.2.1 dual-range transmission, n—a type of transmission in
Test Transmission 6.2
which the driver first shifts through all of the mainbox gear
Transmission Mounts 6.3
ratios in low range, and then shifts to high range and shifts
Oil-Circulating System 6.4
Oil Return Hole 6.5
through the mainbox again. The section containing the high-
Air Pressure Controls 6.6
low range is the compound section.
Drive System 6.7
Instrumentation 6.8
3.2.2 friction disk, n—a steel circular plate to which a
Thermocouple Placement 6.9
friction material has been bonded.
Reagents and Materials 7
Safety 8
3.2.3 glazed, adj—the condition of the friction disks when
Preparation of Apparatus 9
precipitates have filled the pores in the friction material,
Cleaning of Parts 9.1
polishing the surface, and changing the frictional properties.
Assembly 9.2
Calibration 10
Transmission and Test Stand Calibration 10.1
Reference Oils 10.2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Reference Oil Test Frequency 10.3
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Instrumentation Calibration 10.4
Shift Time Calibration 10.5 Standards volume information, refer to the standard’s Document Summary page on
Operating Procedure 11 the ASTM website.
System Flush and Charge 11.1
Available from SAE International (SAE), 400 Commonwealth Dr.,Warrendale,
Test Operation 11.2
PA 15096, http://www.sae.org.
Shut-Down Procedure 11.3
Available from Standardization Documents Order Desk, DODSSP, Bldg. 4,
Transmission Disassembly 11.4
Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098.
Determination of Test Results 12
Available from Volvo Powertrain, North America, 13302 Pennsylvania Ave.,
Failure Criteria 12.1
Hagerstown, MD 21742.
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D5579 − 19
TABLE 1 Recommended Test Stand Components
3.2.4 reaction disk, n—a steel disk that mates with the
friction disk during synchronization. Item Manufacturer Part No.
Panel Meters
3.2.5 shift time, n—the period of time required, when
Tailshaft rpm Newport P-6031D20D
shifting from high range to low range, for the countershaft
Countershaft rpm Newport P-6031D20D
speed to increase from 500 r⁄min to 1700 r⁄min; or when Shift time Newport P-6031D20D
Coast down time Newport P-6031D20D
shifting from low range to high range, for the countershaft
Control Indication
speed to decrease from 1700 r⁄min to 500 r⁄min.
Temperature controller Omron ESEX-AF
Temperature indicator Newport INF-0-0-0-0-JF
3.2.6 synchronizer, n—a pack of friction and reaction plates
Cycle counter Redington P2-1006-115AC
usedtomatchthespeedsofthelow-andhigh-rangegearsprior
Cycle timer Omron H5BR-B-AC100-240
T/C selector switch Thermo Electric 33112
to engagement.
Oil psi gage/safety Murphy A-20EO, O-30 psi
3.2.7 unsynchronized shift, n—a shift in which the speed of
Air supply gage U.S. Gage P44U, O-160 psi
Air regulator Norgren RO-8-300 RNMA
the mating gears is not matched to the speed of the transmis-
Shift solenoid Asco 8317G35, 3-way
sion output shaft by the synchronizer.
solenoid
Mag. pickup Electro 3010AN
4. Summary of Test Method
12 VDC Power supply Sola SLS-12-017
Air pressure switch Penn P61AG-1
4.1 Prior to each test run, the transmission is disassembled
Relays—AC Potter & Brumfield KUP14A15
and all parts, including the case and the oil-circulating and Relays—DC Potter & Brumfield KUP14D15
Mechanical Components
heating systems, are thoroughly cleaned. The transmission is
Air lines Mack 101AX24R, ⁄8 in. OD
rebuilt with a new synchronizer assembly, including measured
Pump Brown & Sharp No. 2
shifter fork, friction, and reaction disks. All other worn or
Heater element Chromalox MOT330A, 220v, 1Ph
Oil lines Aeroquip EC-350, No. 12
defective parts are replaced.
U Joint yoke Mack 1710 Series,
38MU3413M
4.2 The rebuilt transmission is installed on a test stand.
Drive shaft Rockwell 1710 Series, 52 in.
4.3 Thetransmissionandoilsystemareflushedwiththetest collapsed
Drive motor General Electric 25-hp Induction Motor,
oil in accordance with the flush procedure.
1760 rpm
High-Speed Recording System
4.4 The flush oil is drained, and the test oil is measured and
Pressure transducers Sensotec A-5/1034, 0-100 psi
charged to the transmission.
Oscillograph Astro-Med Dash 4
4.5 The transmission is started and operated in low range
until the oil temperature reaches the test operating range.
the transmission are to be removed and some are to be added
4.6 The transmission is automatically cycled between low
before testing, as listed in Table 2. The main box shift rail
and high range until two unsynchronized shifts occur or the
cover can be replaced with an aluminum plate to facilitate
desired length of test is reached without failure. The time
transmission cleaning at end of test.
required to shift from high range to low range is recorded each
6.3 Transmission Mounts—The transmission is mounted as
hour.
shown in Fig. 2.
4.7 At the conclusion of the test, the test parts are removed
6.4 Oil-Circulating System—The system heats the oil to the
and visually inspected. The shifter fork and friction plates are
specified operating temperature of 250 °F 6 5 °F (121 °C 6
measured again to determine wear.
2.7 °C) and maintains this temperature throughout the duration
of the test. The power density of the heater is not high enough
5. Significance and Use
2 2
to cause degradation of the oil (22 W/in. to 25 W/in.
5.1 This test method is used to evaluate automotive manual
2 2
(3.4 W⁄cm to 3.9 W⁄cm )). The oil flow rate is between
transmission fluids for thermal instability, which results in
6 gal⁄min and 10 gal/min (23 L⁄min to 38 L/min).Alayout of
deterioration of synchronizer performance.
the oil-circulation system is shown in Fig. 3. A detailed
5.2 This test method may also be utilized in other specifi-
drawing of the recommended oil heating chamber is shown in
cations and classifications of transmission and gear lubricants
Fig. 4. The total oil capacity of the test system is 5.25 gal
such as the following:
(19.87 L) with the oil level in the transmission at the lower
5.2.1 (final API designation of PG-1),
edge of the fill hole. If the system capacity is too small,
5.2.2 Military Specification MIL-L-2105,
increase by lengthening oil hoses.When the system capacity is
5.2.3 SAE Information Report J308 Axle and Manual
too great, decrease by shortening hoses, if it is practical to do
Transmission Lubricants, and
so; otherwise, install an inert (stainless steel) block in the
5.2.4 Mack Truck GO-H Gear Lubricant Specification.
transmission main box sump to raise the oil level. Route the oil
lines so that they will empty completely when draining the
6. Apparatus
system.
6.1 Table 1 is a list of the make and model of recommended
6.5 Oil Return Hole—Drill and tap a hole in the compound
instruments and equipment.
case for the oil to return after flowing through the heat
6.2 Test Transmission—The test transmission is a MACK exchanger. The location and size of this hole are shown in Fig.
T2180, configuration 11KBA51431 (see Fig. 1). Some parts in 5.
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D5579 − 19
NOTE 1—Left side view.
NOTE 2—See Table 2 for references to letters in brackets.
FIG. 1 Transmission Modified for Testing
TABLE 2 Transmission Parts to Be Added or Removed Before Testing
NOTE 1—Letters in brackets, [ ], refer to locations indicated on Fig. 1.
Parts to Be Removed
Rails, forks, springs, and ball from the
mainbox shift cover [A]
All main box gearing [B]:
Main shaft gears and thrust washers
Countershaft assemblies
Sliding clutches Mack part numbers 320KB3136 or Volvo part numbers 25101998
(2)320KB3137A (2)25503685
Compound [C]
Splitter clutch Mack part number 320KB3141
Splitter piston Mack part number 336KC333 or Volvo part number 25125890
Splitter fork Mack part number 575KB3378 or Volvo part number 25502825
Bell Housing [D]
All clutch related parts
Shafts Mack part number 604KC277A, or Volvo part number 25085391 N/A
604KC34B
Yoke Mack part number 301KD43B or Volvo part number 25128328
Parts to Be Added
Speedometer plug Mack part number 37KC12 or Volvo part number N/A
Speedometer washer Mack part number 37AX419 or Volvo part number 20704759
Orifice to range valve Mack part number 63AX3466 or Volvo part number 25107528
Replace cast iron piston housing cover
with fabricated steel cover [E]
6.6 Air Pressure Controls—The transmission is shifted by the synchronizer shift smoothly without the opposing torque, a
air pressure applied to alternating sides of the range shift vibrationinthedrivelineisintentionallyexcited.Thedriveline
piston. The air pressure is provided by a pilot valve, which is is set out of phase by rotating the yoke at one end of the shaft
cycled by a solenoid valve at a rate of 5 cpm. These cycles are with respect to the other by a one spline tooth offset (22°). The
recorded by a counter, which provides the cycles to mis-shift transmission output shaft is offset from the shaft of the motor
data for the pass/fail criteria of the test. A typical air control orjackshaft,therebyplacingthedrivelineatanangle.Alayout
system is shown in Fig. 6. showing the offset of the transmission relative to the jack shaft
is shown in Fig. 2.
6.7 Drive System—In the truck operation, opposing torques
help the synchronizer to complete the shift. In the test stand, 6.8 Instrumentation—Supply sensors and displays, either on
the transmission is driven from the rear by an electric motor the test console or in a data logging computer, as follows:
andbeltdrivewithnoloadingontheinputpinion.Thetorques, 6.8.1 Oil sump temperature,
therefore, are not present, and shifting can be delayed. To help 6.8.2 Countershaft speed,
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D5579 − 19
FIG. 2 Typical Layout of Drive System
8.0 in. (203 mm) forward of the back wall of the main case.
Position the tip of the thermocouple to extend 1.5 in. (38 mm)
into the sump. As a means of ensuring that the oil is not
exposed to excessive heat in the heater, place an additional
thermocouple to measure the oil temperature leaving the heater
as shown in Fig. 7.
7. Reagents and Materials
7.1 Oil—Approximately 12 gal (45.4 L) of test oil is
required.The integrity of the test oil is the responsibility of the
oil supplier.
7.2 Solvent—Use only mineral spirits meeting the require-
ments of Specification D235, Type II, Class C for Aromatic
Content(0-2%vol),FlashPoint(142°F/61 °C,min),andColor
(not darker than +25 on Saybolt Scale or 25 on Pt-Co Scale).
(Warning—Combustible. Health hazard.) Obtain a Certificate
of Analysis for each batch of solvent from the supplier.
8. Safety
FIG. 3 Schematic of Oil System
8.1 The following are suggestions of procedures and equip-
6.8.3 Tail shaft speed, mentthatmayassistinreducingsafetyhazards.Noattempthas
6.8.4 Air pressure (system), been made to address all possible safety problems. The user of
6.8.5 Air pressure (dynamic during shifting), and this test method is responsible for establishing appropriate
6.8.6 Coast down time. safety and health practices.
6.9 Thermocouple Placement—Transmission sump tem- 8.2 The operating of transmission tests can expose person-
perature is measured in the compound section of the transmis- nel and facilities to a number of safety hazards. Only personnel
sion with a thermocouple and conventional display equipment. who are thoroughly trained and experienced in transmission
Drill and tap the compound case to accept the thermocouple at testing should undertake the design, installation, and operation
a position located along the centerline of the transmission of transmission test stands.
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D5579 − 19
NOTE 1—Material 1018 is similar material.
NOTE 2—All dimensions are in inches, unless otherwise noted.
FIG. 4 Typical Oil Heater Chamber
FIG. 6 Air Control and Supply System
NOTE 1—Figure is not drawn to scale.
FIG. 5 Oil Return Hole Location
8.3 Each laboratory conducting transmission tests should
have its test installation inspected and approved by its safety
department. Personnel working on the transmissions should be
providedwiththepropertools,bealerttocommonsensesafety
practices, and avoid contact with moving or hot transmission
parts, or both. Heavy-duty guards should be installed around
the driveline. When the test stand is operating, personnel
FIG. 7 Location of Oil Out-of-Heater Thermocouple, Pressure
should be cautioned against working alongside the transmis-
Regulator, and Sensor
sion and drivelines.All oil lines and electrical wiring should be
properlyroutedandgrounded,guarded,andkeptingoodorder.
Safety masks or glasses should always be worn by personnel 8.4 The external parts of the transmission and the floor area
working on the transmissions. Loose or flowing clothing, long around the transmission should be kept clean and free of oil
hair, or other accessories to dress that could become entangled, spills. In addition, the working area should be free of all
should not be worn near rotating equipment. tripping hazards. In case of injury, no matter how slight, first
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D5579 − 19
aid attention should be applied at once and the incident 9.1.1 Transmission Case—Thoroughly clean the transmis-
reported. Personnel should be alert for leaking oil, which sion case with a cleaning solvent (see 7.2) to remove any oil,
represents a fire hazard. Do not permit containers of oil to sludge, or varnish deposits remaining from the previous test
accumulate in the test area. and then air dry.
9.1.2 Gears, Shafts, Synchronizer—Remove all sludge,
8.5 A remote station for shutting off the motor, pump, and
varnish, and deposits. Rinse with a cleaning solvent (see 7.2)
heater is recommended. Fixed fire-protection equipment
and air dry.
should be provided.
9.1.3 Heater, Oil-Circulating System—Flush oil lines with a
8.6 Normal precautions should be taken when using flam-
cleaning solvent (see 7.2) to remove any previous test oil and
mable solvents for cleaning purposes. Make sure adequate
then air dry. Disassemble the heater, clean, and air dry after
ventilation is provided and fire-fighting equipment is immedi-
each test. Check the heater periodically for leaks and replace
ately accessible.
when necessary.
8.7 It is recommended that safeties be provided to shut
9.2 Assembly:
down the drive motor and oil heater when the following
9.2.1 General—AssembleallpartsasinstructedintheMack
conditions occur:
Transmission Service Manual T2130/2180, except where the
8.7.1 Oil temperature in transmission sump becomes
service manual applies to parts that are modified for this test
excessive,
method. Refer to Table 3 for a list of approved test hardware
8.7.2 Oil temperature leaving the oil-heating chamber be-
partnumbers.Usetestoilforlubricatingpartsduringassembly.
comes excessive,
9.2.2 New Parts—Obtain the following parts from an au-
8.7.3 Oil-circulating system loses pressure, thorized Mack truck dealer. Install the new parts listed in Table
8.7.4 Motor over-speeds or under-speeds, and 4 for each test:
9.2.2.1 Inspect the following parts after each test and
8.7.5 The fire-protection system is activated.
replace if worn or damaged:
8.8 See Fig. 8 for a typical schematic of safety circuits.
Number Mack Volvo
Required Part No. Part No.
9. Preparation of Apparatus
Thrust Washer 3 223KD249 25500345
Thrust Washer 2 223KD316A 25500919
9.1 Cleaning of Parts:
Clutch Housing 2 53KC486C 25502585
A A
High Range Main Shaft Gear 1 751KB4123 25502562
or or
B B
751KB4176 21649207
TABLE 3 Part Numbers for Approved Hardware
Test Hardware Part Numbers
Part description Mack Part Volvo Part
Number Number
A A
Synchronizer clutch assembly 320KB459A 25132811
or or
B B
320KB463 21636360
Synchronizer pin (3 each) 301KC33 25500623
Synchronizer pin (3 each) 301KC34 25498886
Synchronizer pin (3 each) 301KC35 25500385
Synchronizer pre-load spring (3 each) 107KD247 25500680
A A
High range mainshaft gear 751KB4123 25502562
or or
B B
751KB4176 21649207
A A
Low range mainshaft hub 84KC47 25502560
or or
B B
84KC411 21631781
Compound mainshaft, rear 601KC432 .
Bearing, compound mainshaft 46AX538 25499676
Snap ring (2 each) 97AX151 or 25108495
97AX171
Snap ring (2 each) 97AX267 .
Shift rail 591KC3154A .
O-ring, low range shift piston 56AX560 25108495
C
Piston, high low range shift 336KC318 .
Cylinder housing, hi-lo shift piston 55KC46A .
O-ring, range high low shift piston 56AX588 20705679
Countershaft gear, front 757KB3322 or .
757KB4108
Countershaft gear, rear 757KB4106 .
Range shift valve 216KD42 21041938
A
Parts required in hardware “CONFIGURATION 2”.
B
Parts required in hardware “CONFIGURATION 3”.
C
The piston, high low range shift, has an outside diameter of 3.740 to 3.738 in.
(95.00 to 94.95 mm).
FIG. 8 Typical Schematics of Safety Circuits
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D5579 − 19
TABLE 4 New Parts for Each Test
9.2.5.5 Mack specifications call for a preload of from
Name Quantity Mack Part Volvo Part 0.002 in. to 0.006 in. (0.051 mm to 0.152 mm). To accomplish
Number Number
this,adjusttheshimpackthicknessbyremovingshimsequalto
Friction plate 8 N/A N/A
the measured end play plus 0.002 in. to 0.006 in. (0.051 mm to
Range fork 1 575KB457 25126946
A A 0.152 mm) additional.
Low range main shaft hub 1 84KC47 25502560
or or
9.2.5.6 Repeat this procedure for the other two counter-
B B
84KC411 21631781
A A
shafts.RecordthemeasurementsontheforminFig.A7.3oran
Sliding clutch 1 320KB459A 25132811
or or
equivalent.
B B
320KB463 21636360
Pin 3 301KC33 25500623 9.2.6 Transmission Torque Measurement— Rotate the trans-
Pin 3 301KC34 25498886
mission so that it is in the horizontal position. With the
Spacer tube 3 301KC243C 25501259
transmission in low range and dry, measure the break and turn
Ball/Pin 6 301KC35 25500385
Spring 6 107KD247 25500650 torques by turning the output shaft clamp plate capscrew, with
Reaction disk 8 495KB367 25097624
a torque wrench, in the normal direction of rotation. Make the
A
New parts to be used in combination with Part No. 751KB4123 or 25502562 as
measurements three times and report the average of both the
hardware CONFIGURATION 2. Identify the test as “CONFIGURATION 2” in the
break and turn values (see Fig. A7.3). Continue with the
space provided in the test report.
B
assembly of the test apparatus.
New parts to be used in combination with Part No. 751KB4176 or 21649207 as
hardware CONFIGURATION 3. Identify the test as “CONFIGURATION 3” in the
9.2.7 Transmission Coast Down Measurement—With the
space provided in the test report.
driveshaftinstalledbutbeforeattachingthetopcover,measure
the time for the countershafts to coast down from
1500 r⁄min to 500 r⁄min, as follows:
9.2.7.1 Shift the transmission into low range. Using a spray
A
One of the parts required in hardware “CONFIGURATION 2”.
B
bottle charged with the next test oil, spray approximately ⁄2 oz
One of the parts required in hardware “CONFIGURATION 3”.
(15 mL) lubricant on each of the main shaft, tail shaft, and six
9.2.3 Inspection of Air Valves—Inspect the piston of the
countershaft bearings.
range shift valve and the fork air cylinder and replace if
9.2.7.2 Start the drive motor and bring up to speed (coun-
damaged or visibly worn. Replace the O-rings in these valves
tershaft at 1750 r/min). Turn off the motor and allow the
when nicked, cut, softened, or hardened. However, replace
transmission to coast down to at least 500 r/min. Electronically
these O-rings at least every six months. Install a ⁄16-in.
measure the time required for the countershafts speeds to
(1.59 mm) thick shim between the shaft cylinder and the
decrease from 1500 r⁄min to 500 r⁄min using a meter capable
transmission case for “CONFIGURATION 2” and “CON-
of measuring to 0.01 s. See Table 1 for a recommendation.
FIGURATION 3” tests.
Repeat the coast downs until five readings have been obtained.
9.2.4 Pre-test Measurements—Measure the range fork for
Calculate the average of these five readings, and record the
hardnessandthicknessatthelocationsshowninFig.A7.1.The
readings and their average in the appropriate spaces in Fig.
hardness of the fork pads shall be a minimum of 55 R at each
c
A7.3.
ofthefourlocations.Markthefrictiondisksonthesplinetangs
with an etching tool at three locations equally spaced. Measure
10. HTCT-specific Calibration and Standardization Items
and record the pad thickness at these locations in the Data
(See Annex A2 for general calibration and standardization
Dictionary (see Annex A6).
information)
9.2.4.1 This hardness is greater than the manufacturing
minimum. Some parts meeting the manufacturing specification 10.1 Transmission and Test Stand Calibration—Calibrate
transmission and test stands by running tests on reference oils.
may be rejected for this test method.
9.2.5 Countershaft Bearing P
...