TRANSMISSION OIL PUMP MAINTENANCE - continued

TM 9-2320-386-24-1-2

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TRANSMISSION OIL PUMP MAINTENANCE (Contd)

CLEANING AND INSPECTION

WARNING

Volatile mineral spirits burn easily and fumes can explode. Do not

smoke or allow flames nearby when using volatile mineral spirits.

Failure to do so may cause serious injury or death to personnel.

1. All metallic parts should be cleaned thoroughly with mineral spirits and dried with lint-free rag.

2. Inspect stator shaft (8) and spur gear (1) for chips, cracks, burrs, and twisted splines. Remove burrs

with soft stone. Replace front support (4) if stator shaft (8) is chipped or cracked, or splines are

twisted.

3. Using seal ring gauge, check hub seal ring grooves (7) of front support (4) for proper fit. Insert seal

ring gauge in seal ring grooves (7) and rotate completely around circumference of hub (4). If seal ring

gauge does not insert in seal ring grooves (7) or rotate freely around hub (6), replace front support (4).

NOTE

Perform steps 4 and 5 if movement is apparent between stator

shaft and front support.

NOTE

Perform step 4 for AT1545P transmissions only.

4. Remove plug (3) from regulator valve bore (2).

5. Inspect bearing (5) in stator hub (6) for movement. Remove and discard bearing (5) if movement

exists.

NOTE

Proper end play and side clearance of oil pump gear must be

established prior to assembly of oil pump.

6. Check oil pump drive gear clearance:

a. Position oil pump (11) on bench with flat side upward.

b. Install drive gear (9) with internal tangs facing upward.

c. Install drive gear (10) with diamond-marked side facing downward.

d. Position pump gear gauge set and dial indicator on oil pump (11). Ensure plunger contacts face

of oil pump (11).

e. Zero dial indicator.

f. Slide dial indicator into position over drive gear (10). Ensure plunger contacts face of drive

gear (10), and record clearance reading on dial indicator.

g. Clearance reading should be 0.0008-0.0022 in. (0.020-0.056 mm) for new gear, or

0.0008-0.0026 in. (0.020-0.066 mm) for used gear.

h. If reading is not within limits, replace drive gear (10) and recheck clearance.

i. Repeat steps a through g for drive gear (9).

7. Check drive gear diametrical clearance:

a. Using feeler gauge, measure gap between drive gear (10) and oil pump bore (12).

b. If gap is not within 0.0055-0.0085 in. (0.14-0.22 mm) for new gear, or 0.0055-0.0089 in.

(0.14-0.23 mm) for used gear, replace drive gear (10).

Change 1

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