Clutch Free Pedal Travel Adjustment; Insufficient Clutch Release - Chevrolet 10 1971 Series Chassis Service Manual

CLUTCHES AND TRANSMISSIONS 7-2
PA 20-30
The clutch operating controls (figs. 1 and 2) for
trucks are a mechanical type consisting of a pendant type
pedal, return spring, pedal push rod, cross-shaft, fork
push rod, clutch fork and throwout bearing (fig. 1). The
pedal push rod is routed vertically, inside the cab, from
the pedal lever down through a seal boot on the toe pan,

CLUTCH FREE PEDAL TRAVEL ADJUSTMENT

Only one simple adjustment is necessary to maintain
clutch efficiency and assure long life. This adjustment is
for the amount of free clutch pedal travel before the
throwout bearing contacts the clutch fingers. As clutch
facings wear, the amount of free pedal travel is reduced
and in time this will result in clutch slippage. Therefore,
it is necessary to adjust pedal at periodic intervals to
provide sufficient free pedal travel (fig. 4) to permit
full engagement of the clutch.
1. Disconnect clutch fork return spring at fork.
" "
2. Loosen nut A (fig. 3) and back off from swivel ap­
proximately 1/2 inch.
3. Hold clutch fork push rod against fork to move
throwout bearing against clutch fingers (push rod will
slide through swivel at cross-shaft).
4. Adjust nut " B" to obtain approximately 3/16" to 1/4"
clearance between nut
5. Release push rod, connect return spring and tighten
nut " A" to lock swivel against nut " B" .
V IE W B
PE 20-30
Fig. 2— Clutch Pedal and Linkage Assy. (P20-30)
M AINTENANCE A N D ADJUSTMENTS
and swivel.
to the cross-shaft lever. When the clutch pedal is de­
pressed, the pedal pull or push rod moves upward rotat­
ing the cross-shaft, pushing the fork push rod rearward,
and pivoting the clutch fork to move the throwout bearing
against the clutch release fingers and releasing the
clutch.
6. Check free pedal clearance at pedal (3/4" to 1" is
proper clearance). Readjust if necessary.

INSUFFICIENT CLUTCH RELEASE

Where complaints of first or reverse gear clash due to
insufficient clutch release are encountered, the following
may be helpful. Cut off the existing clutch pedal stop
bumper to a height of 3/8". Since shortening the bumper
increases the lash and not the usable stroke, the lash
must be reduced to specifications in order to gain the
additional stroke benefit.
CLUTCH PEDAL REPLACEMENT (Fig. 5)
Removal
1. Pull parking brake lever to applied position.
2. Remove bolt at clutch pedal push rod lever, then
remove lever from pedal shaft.
3. Hold pedal pad with one hand and slide pedal and
shaft assembly outboard enough to clear pedal stop,
then allow return spring (or overcenter spring) to
V IE W C
10-30 CHEVROLET TRUCK SERVICE MANUAL