Publicidad
Idiomas disponibles
Idiomas disponibles
CLUTCH SET -UP PROCEDURE
NOTE: Clutches are adjusted at the factory to original equipment specifications and should require very little inter-
nal adjustment to achieve proper release and engagement. The clutch must not be adjusted to accommodate thin
or worn flywheels, or worn linkage, yoke and/or cross shaft bushings, or to accommodate other drive train deficien-
cies. Adjustment for such purposes will either cause the clutch to not function properly or will cause early clutch
failure and will be apparent on factory inspection of warranty claims, thereby voiding the manufacturer warranty.
STEP #1
After transmission installation, check the clearance between the yoke tips and wear pads on bearing housing for 1/8"
clearance. This determines pedal freeplay (Mechanical Linkage Only). (See Figure 6)
Adjust the clutch linkage to increase or decrease the yoke-to-bearing clearance. NEVER USE THE INTERNAL
CLUTCH ADJUSTMENT FOR THIS PURPOSE.
STEP #2
Check for proper clutch brake and bearing gap of 1/2" to 9/16". If the gap is too small verify DIM B (Figure 4 or Figure
6). If DIM B is correct and a fiber spacer or oversized clutch brake was installed, remove the fiber spacer and/or re-
place oversized clutch brake with standard thickness clutch brake. NOTE: If the gap is larger than 9/16" and DIM B
is correct then one of the following conditions exists. Fiber spacer/over-sized clutch brake was not installed or input
shaft length needs to be re-measured as seen in Figure 4. DO NOT ADJUST THE CLUTCH!
THIS DIMENSION IS CRITICAL. DO NOT VARY — EITHER OVER OR UNDER THESE DIMENSIONS — UNDER
ANY CIRCUMSTANCES.
REMINDER: The bearing must move a minimum of 1/2" or clutch will not release. Eliminate lost motion before check-
ing for 1/2" movement. Lost motion is generally caused by loose or worn linkage, or worn yoke or cross shaft bushings.
STEP #3
Verify the clutch brake squeeze by inserting .010 feeler gauge between bearing and clutch brake, then depressing the
pedal to end of stroke. The feeler gauge must be tightly clamped between the bearing and the clutch brake. This veri-
fies the contact of the bearing to the clutch brake.
The clutch brake will be squeezed if the total pedal stroke slightly exceeds the movement required to move the yoke/
fork 5/8" to 11/16" (the combined total of the 1/8" clearance between yoke tips and wear pads and the 1/2" - 9/16"
brake squeeze gap.
IN THE EVENT THE BRAKE IS NOT BEING SQUEEZED, DO NOT CHANGE THE 1/2" - 9/16" GAP FOR THE
CLUTCH BRAKE, OR THE 1/8" CLEARANCE FOR THE BEARING HOUSING — CONSULT THE VEHICLE MANU-
FACTURER SERVICE MANUAL.
In analyzing the reasons for the brake not being squeezed, other things to check for are:
A.
Worn linkage components or yoke and cross shaft bushings. If necessary, replace those
components.
B.
Improper linkage assembly. Verify that linkage is assembled in the correct hole locations.
C.
Pedal stroke. To adjust, raise the upper and/or lower the lower pedal stops.
D.
If the clutch is hydraulically assisted, make sure the slave and master cylinders are functioning properly.
NOTE: MAXIMUM BRAKE SQUEEZE (IN CAB OF TRUCK) SHOULD NOT EXCEED 1" FROM THE END OF PEDAL
STROKE. IF IT DOES, IT CAN BE ADJUSTED BY:
A.
Changing pedal stops in cab to reduce total pedal stroke.
B.
Increasing 1/8" yoke-to-bearing setting to lower squeeze. (This will increase free-pedal travel.)
4
Publicidad
