30
8305557-R2
PERIODIC MAINTENANCE
FK0639.eps
Inspect forks
NOTE:
Use fork calipers on forks up to and including 4 in.
(100 mm) thick. Fork calipers indicate a 10% wear factor if
the calipers can pass over the blade cross-section.
A
Remove fork shoe hardware from forks. For reassembly,
tighten fork shoe nut to a torque of 82 ft.-lbs. (111 Nm).
B
Measure the fork shank thickness with the caliper outer
teeth approximately 2 in. (50 mm) above top of blade.
Hold this setting for step C.
C
Position the caliper inner teeth on the fork arm blade
approximately 3 in. (76 mm) out from the face of the
shank.
• If the inside teeth of the caliper hit the fork, it has
less than 10% wear and requires no replacement.
• If the inside teeth of the caliper pass over the fork
freely, the fork must be taken out of service. The
fork has 10% wear and 20% reduction in capacity.
3 in. (76 mm)
Fork Arm Blade
Cross Section
100 %
Fork Arm Blade
Cross Section
90 %
OK
Repair or
Replace
Remove
Fork Shoe
B
A
C
Inspect fork hooks and carriage bar
clearance
NOTE:
Use Go/No-Go Wear Gauge Part No. 209560
(Class II) or 209561 (Class III).
A
Inspect the fork lower hooks and carriage bar. If the
gauge fits between the carriage bar and lower hook,
repair or replacement is needed.
B
Inspect the upper carriage bar. If the gauge arrow
touches the carriage bar, repair or replacement is
needed.
C
Inspect the fork upper hooks. If the gauge arrow
touches the hook, repair or replacement is needed.
FP0832.eps
OK
OK
OK
FORK LOWER HOOKS, CARRIAGE
UPPER CARRIAGE BAR
FORK UPPER HOOKS
Wear
Gauge
2000-Hour Maintenance
After 2000 hours of truck operation, forks in use shall
be inspected at intervals of not more than 12 months
(for single shift operations) or whenever any defect or
permanent deformation is detected. Severe applications
will require more frequent inspection.
