TM 9-2320-280-20-2
5-2. TRANSMISSION SERVICE
This task covers:
a. Draining Fluid
c. Transmission Filter Installation
b. Transmission Filter Removal
d. Replenishing Fluid
INITIAL SETUP:
Tools
Manual References
General mechanic’s tool kit:
TM 9-2320-280-10
automotive (Appendix B, Item 1)
TM 9-2320-280-24P
Materials/Parts
General Safety Instructions
O-ring seal (Appendix G, Item 157)
Drycleaning solvent is flammable and will not be
Filter assembly (Appendix G, Item 32)
Transmission oil pan gasket
used near an open flame.
(Appendix G, Item 46)
Two locknuts (Appendix G, Item 107)
Transmission fluid (Appendix C, Item 26 or 27)
Drycleaning solvent (Appendix C, Item 18)
a. Draining Fluid
NOTE
Transmission service for the 3L80 and 4L80-E transmissions is
basically the same. Differences are noted.
Do not shift through driving gear ranges when warming trans-
mission fluid for removal. Shifting through driving gear ranges
is a procedure used only when refilling transmission fluid.
Transmission should be warm when draining fluid.
Have drainage container ready to catch fluid.
1. Remove drainplug (1) and gasket (2) from oil pan (3). Allow fluid to drain.
NOTE
Inspect fluid for grit, foaminess, and/or milkiness. If present, notify
DS maintenance.
2. Install gasket (2) and drainplug (1) in oil pan (3) and tighten drain plug (1) to 20 lb-ft (27 Nm).
b. Transmission Filter Removal
NOTE
Perform steps 1 through 5 for 3L80 transmissions only.
1. Remove thirteen capscrews (6), oil pan (3), and gasket (5) from transmission (4). Discard gasket (5).
2. Clean gasket (5) material from transmission (4) and oil pan (3) mating surfaces.
3. Remove capscrew (11), oil filter (10), and spacer (9) from transmission (4).
4. Pull suction tube (8) from oil filter (10) and remove O-ring seal (7). Discard O-ring seal (7).
W A R N I N G
Drycleaning solvent is flammable and will not be used near an open
flame. A fire extinguisher will be kept nearby when the solvent is
used. Use only in well ventilated places. Failure to do this may
result in injury to personnel and/or damage equipment.
5. Clean suction tube (8) and oil pan (3) thoroughly with drycleaning solvent.
5-2
