TM 9-2320-272-24-4
5-46. TRANSMISSION OIL PUMP AND FRONT SUPPORT MAINTENANCE (Contd)
CAUTION
Early model and late model converter pump hub, Front support seals,
and oil pump are not interchangeable. Do not intermix parts from
early and late transmissions. Damage to transmission will result.
For general cleaning instructions, refer to para. 2-14.
1.
For general inspection instructions, refer to para. 2-15.
2.
Inspect oil pump gears (3) and (4) for broken teeth. Discard gears if broken.
3.
Install oil pump gears (3) and (4) in pump body (2).
4.
Place straightedge (1) across face of oil pump (2).
5.
Measure clearance between straightedge (1) and gear (4). If clearance is more than 0.0020 in.
6.
(0.051 mm), replace with thicker gear (4). Repeat steps 4 through 6.
NOTE
Perform step 7 for late model transmissions only. Early model
transmissions do not have bushing.
Measure inside diameter of bushing (5) on oil pump (2) at 5 o'clock position when viewed from the
7.
front. Maximum wear limit is 2.257 in. (57.33 mm). Brass backing showing through is acceptable if
wear limit is not exceeded.
Inspect bushing (5) on oil pump (2) for scoring. Replace bushing (5) if scoring can be felt. Use
8.
installer/remover tool and arbor press.
Inspect bushing (5) on oil pump (2) for discoloration due to overheating. Replace if discolored.
9.
Inspect all springs for discoloration due to overheating. Discard if discolored.
10.
Inspect all springs for broken coils or coils distorted due to wear. Discard if broken or distorted.
11.
Using spring tester, inspect for serviceability by checking load when spring is compressed to the
12.
correct length. Discard spring if spring does not give the correct load (table 5-12).
Table 5-12. Spring Data.
FREE LENGTH
COMPRESSED LENGTH
UNDER LOAD
COLOR
SPRING
2.01 in.
3.57 in.
70.6-76.6 lb
Main pressure
Green
(90.7 mm)
(51.0 mm)
(314-341 N)
regulator valve spring
1.24 in.
1.05 in.
33.1-40.5 lb
Converter pressure
Blue
(147-180 N)
(31.5 mm)
(26.7 mm)
regulator valve spring
1.46 in.
26.1-28.9 lb
2.84 in.
Yellow
Lockup valve spring
(116-129 N)
(72.1 mm)
(37.1 mm)
5-314
