Chevrolet 70 Series 1970, Service Manual

Page: 660 / 841

TRANSMISSIONS AND CLUTCHES 7-61
CLUTCH TROUBLESHOOTING (LIPE AND LON G)
SYMPTOMS AND PROBABLE CAUSE
PROBABLE REMEDY
SLIPPING
1. Im proper adjustm ent. 1. Adjust s la v e cy lin d er tra v el cle a r a n c e or if
control is of link type, make adjustm ent at
r e le a s e fork or le v e r adjustm ent rod.
2. Oil soaked clutch d isc . 2. Install new d isc .
3. Worn sp lin e s on tr a n sm issio n d rive gear. 3. R eplace d rive gear.
4. Lining lo o s e on clutch d isc .
4. Install new d isc .
5. Warped p r e ssu r e plate or engine flyw heel. 5. R eplace p r e s s u r e p late or fly w h eel.
GRABBING
1. Oil on d isc lining. 1.
Install new d is c .
2. Worn sp lin e s on tra n sm issio n d rive gear.
2. R eplace d rive gear.
3. L o o se engine m ountings. 3. Tighten or rep lace engine m ountings.
4. Warped p r e ssu r e plate or engine flyw heel.
4. R eplace p r e s s u r e p late or flyw h eel.
RATTLING
1. Weak retractin g sp rin g s.
1. R eplace sp rin gs.
2. R e le a se fork lo o se on ball pivot stud.
2. Check stud and retaining spring and if
n e c e ssa r y , rep la ce.
NOISY
1. Worn clutch r e le a s e bearing.
1. R eplace r e le a s e bearing.
HYDRAULIC CONTROLS
PEDAL SPONGY
1 A ir in clutch hydraulic lin e.
1. Bleed clutch sla v e cy lin d er.
EXCESSIVE PEDAL TRAVEL
1. Leaking sla v e cylin d er lin e.
1. Tighten or rep lace lin e.
2. Fluid low in hydraulic m a ster cylinder.
2. F ill cylin d er to 1 / 2 ” below top of r e s e r v o ir .
3. Clutch m aster cylin d er push rod le v e r lo o se
or not properly adjusted.
3.
Adjust length of clutch push rod under dash.
CLUTCH PEDAL RELEASES CLUTCH BUT
PEDAL GRADUALLY TRAVELS DOWNWARD
1. Clutch m aster cy lin d er lea k s past prim ary cup.
1
. Overhaul m aster cylin d er.
2. E xternal leak s.
.2.
Tighten all lin e fittin gs and check for leak s
in lin e. t
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CHEVROLET SERIES 70-90 HEAVY DUTY TRUCK SHOP MANUAL