Chevrolet 1977 10 Series, Руководство по ремонту, Страница: 150 / 468

4B-78
OVERHAUL MANUAL
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Fig. 4 B - 7 H - 3 / 4 Ton U n it
Disassembly
1. Remove ring gear and side bearings following
procedures established for the standard differential.
2. Remove (3) screws on front face of ring gear flange.
3. Set unit on right side case half and gently pry apart
at yoke hole locations Fig. 4B-7H.
4. Remove left side case half. To prevent side gear from
falling out, hold thum b against inside of gear hub while
separating case halves.
5. Inspect com ponents for damage. If the governor
assembly and latching bracket are the only items to be
replaced, remove and proceed to Step 7 of reassembly
procedure. Pry under pinion yoke and remove and proceed
with detailed inspection if further damage is observed.
Fig. 4 B -8 H -3 /4 Ton Assem bly
Inspection
1. Clean all parts with solvent. Inspect all bearings for
chipping or evidence o f excessive wear. Replace parts as
needed.
2. Inspect all differential components for excessive wear
and breakage. Replace parts as needed. THE FOLLOWING
A R E
S E R V IC E A B L E CO M PO N EN TS FOR THIS
DIFFERENTIAL.
• Governor assembly and latching bracket with spring.
• Cam Plate.
• Clutch disc pack with wave spring and guide clips.
• Pinion yoke.
• Pinion gears.
• Pinion thrust washers.
• Reaction blocks (4 sizes).
• Thrust ring.
• Right side shim (4 sizes).
• Left side guide clips.
A ttem pts to service other com ponents will distrub
critical clearances and may result in differential failure. If
reaction blocks or right side shim must be replaced, the
original pieces must be carefully measured for thickness and
replaced with a piece of the same size.
CAM /CLUTCH SERVICE
Disassembly
If cam plate or clutch discs must be replaced, the cam
gear sub-assembly must be serviced as follows: Refer to
Figure 4B-9H.
1. Measure and record overall length o f gear assembly
(front face of gear to back side of thrust ring, include shim).
This dimension will be needed to reassemble unit if thrust
ring is replaced. DO NOT REPLACE THRUST RING
UNLESS NECESSARY. If ring is excessively worn or scored,
check bore in case for scoring. If bore is scored, replace
entire differential.
2. With gear hub end up, compress disc pack and install
jaws o f split ring bearing removed (J-22912) between the
thrust ring and the top eared disc. Bevel side o f bearing
remover should face up toward thrust ring.
3. Place cam gear assembly with bearing remover
attached in an arbor press supporting the bearing remover on
both sides.
4. Install a 1-1/2" to 1-3/4" diameter plug (J-8107-4)
on gear hub. Press against plug with ram o f press to remove
thrust ring. Keep all com ponents in the proper order.
Reassambly
Replace cam plate and/or clutch discs as necessary and
reassemble as follows:
1. Place gear on bench with hub end up.
2. Assemble cam plate with cam form down to mate
with cam form on gear.
3. Assemble onto cam plate: (2) eared discs, (1) splined
disc, and (1) wave spring alternately as shown, Fig. 4B-9H.
4. Assemble onto gear hub: (4) eared discs and (3)
splined discs alternately as shown. Begin and end with an
eared disc.
5. Locate cam gear assembly in arbor press with hub
end up. Place thrust ring on gear hub and press to shoulder
making sure th at ring is square with hub.