MIL-PRF-2104J
TABLE XVIII. Shear stability performance.
Rated or measured parameter
Primary performance criteria
Kinematic viscosity after shearing, mm2/s, min
12.5
3.5.10 Base oil viscosity. Oil grade 15W-40 shall meet the base oil viscosity
(BOV) requirements in accordance with Table XVII. See section 4.3.19 for the
verification test method.
3.6 Transmission frictional characteristics and wear. All oil grades shall maintain
a stable coefficient of friction and shall minimize distress and wear in accordance with
Table XIX during use in heavy-duty automatic and powershift transmissions and other
cooled friction components such as steering, braking and disconnect clutches. See
section 4.4 for the verification test methods.
3.7 Elastomer seal compatibility. All oil grades shall minimize the deterioration,
softening, and/or excessive hardening of elastomer seals in accordance with Table XX.
See section 4.5 for the verification test method.
TABLE XIX. Properties of frictional characteristics and wear.
Rated or measured parameter
Primary performance criteria
Allison Graphite and Paper Friction Test
Measured mid-point dynamic friction
Mid-point dynamic friction Coefficient (see
coefficient shall be greater than or equal to
notes 1/ and section 4.4)
the qualified batch sample mean mid-point
friction coefficient minus 0.012
Allison Graphite and Paper Friction Test
Slip time shall be less than or equal to the
Slip time, seconds (see notes 1/, 2/, and
maximum acceptable slip time criteria
section 4.4)
Caterpillar TO-4 or TO-4M, SEQ1220
90.0 140.0
Average dynamic coefficient, %
91.0 127.0
Average static coefficient, %
Disc wear, mm, max
0.04
Energy limit, m/s, min (see note 3/ and 4.4)
25
Caterpillar TO-4 or TO-4M, SEQFRRET
Average dynamic coefficient, %
85.0 130.0
@ 3000 cycles
90.0 125.0
@ 8000 cycles
90.0 125.0
@ 15 000 cycles
95.0 125.0
@ 25 000 cycles
(see note 3/ and 4.4)
1/
Variation in frictional performance from one batch of friction plates to the next demands that minimum acceptance
criteria be developed with respect to individual batches
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