Copyright © 1996 General Motors Corp. 4–11
GENERAL OVERHAUL INFORMATION
(8) Inspect the hydraulic circuit tracks in the
valve bod(ies) and transmission housing main control
valve body mounting surface for porosity, broken
lands, cracks, dirt, and land surface imperfections. The
tracks identified in Figure 4–5 will assist in locating
troubled areas.
g. Inspecting Bushings, Thrust Washers
(1) Inspect bushings for scores, burrs,
roundness, sharp edges, and evidence of overheating.
Remove scores with crocus cloth. Remove burrs and
sharp edges with a scraper or knife blade. If the bush-
ing is out-of-round, deeply scored, or excessively
worn, replace it, using the proper size replacer tool.
(2) Inspect thrust washers for distortion,
scores, burrs, and wear. Replace if defective or worn.
h. Inspecting Oil Seals, Gaskets
(1) Replace all sealrings (except hook-type),
oil seals, and composition gaskets.
(2) Inspect hook-type sealrings for wear,
broken hooks, and distortion.
(3) Install a new hook-type sealring if the
ring shows any wear on the outside diameter, or if
there is excessive side wear. The sides of the sealring
must be smooth within 0.005 inch (0.13 mm) maxi-
mum side wear. The sides of the shaft groove (or the
bore) into which the sealring fits should be smooth, 50
microinches (1.27 micrometers) equivalent and square
with the axis of rotation within 0.002 inch (0.05 mm).
If the sides of the grooves have to be reworked, install
a new sealring.
CAUTION:
Whenever it is necessary to cut out a defective
bushing, do not damage the bore into which the
bushing fits.
Figure 4–5. Transmission Housing — Main Control Valve Body Mounting Surface Tracks
REVERSEEXHAUSTFOURTH
CLUTCH
SECOND
CLUTCH
FIRST
CLUTCH
THIRD
CLUTCH
TRIMMER
REGULATOR
EXHAUST
CHECK
VALVE
EXHAUST
EXHAUST
MAIN
MAIN
MAIN
MAIN
MODULATOR
MODULATOR
MODULATORGOVERNOR
DRIVE 1
DRIVE 2
DRIVE 3
DRIVE 3
DRIVE 4
FIRST TO
SECOND SHIFT
SECOND TO
THIRD SHIFT
FORWARD CLUTCH
THIRD TO FOURTH
CLUTCH FEED
SECOND TO THIRD
THIRD TO FOURTH
CLUTCH FEED
FIRST
CLUTCH
APPLY
GOVERNOR FEED
REVERSE
REVERSE
EXHAUST
GOVERNOR
MAIN
V02891
To Next Page
Loading...
Need help?
General
