Group 32, Tilt Cylinders
32-2-2 • Tilt Cylinder Checks and Adjustments SM 765, Nov ’06
5. Wait five minutes and measure and write down dis-
tance between rod end and spacer.
6. The measurement must not exceed the following
measures:
Drift Causes and Remedies
Tilt cylinder drift indicates the following possible prob-
lems:
• Tilt cylinder hydraulic circuit hoses or fittings are
leaking. Check the circuit components and repair
as necessary.
• Cylinder piston seals are worn, damaged, or defec-
tive allowing fluid past the piston and causing the
rod to drift. Consider rebuilding the cylinders if the
other remedies in this list are not successful. See
Section 3 for cylinder removal and replacement
and Section 4 for cylinder repair, if necessary.
• The main hydraulic tilt valve is misadjusted, worn,
or defective. Fluid is leaking past the valve and
causing the tilt cylinders to drift. See Group 30 for
hydraulic valve troubleshooting.
Tilt Cylinder Racking Check
Upright racking occurs when tilt cylinder strokes are
unequal. Cylinders should be checked regularly during
operation to determine if cylinder strokes are the same. To
check for racking:
• Make sure uuck is parked on level surface with
parking brake applied and wheels chocked.
• Check condition of the tilt cylinder, rod-end yoke,
mounting pins, piston rod, rod wiper, cylinder
gland, etc., for excessive wear or damage. Make
repairs before making twisting adjustment.
• Use a capacity load (see truck nameplate) centered
on the forks.
CAUTION
!
Be sure to secure the load to the fork carriage
to keep it from falling off when tilted for-
ward.
Raise the upright only to the height that will
allow the fork tips to clear the floor when
tilted fully forward.
Forward Adjustment
1. Slowly tilt upright fully forward to the end of the tilt
cylinder stroke.
2. As the cylinders approach the end of the stroke,
watch both piston rods for equal movement and
upright for twisting. Note if upright “racks” (is
twisted at the end of its movement by unequal stroke
of tilt cylinders).
N
TEN
TEN
TEN
TEN
TE
Correct the twisting effect by shortening the
cylinder that is the longest length. Forward
twisting must be adjusted before backward
twisting. If forward adjustment is not
needed, continue with backward adjustment.
3. To adjust, loosen rod-end yoke capscrew on the tilt
cylinder that extends the farthest, and turn piston rod
into rod-end yoke to shorten.
Forward Adjustment: Pneumatic-tire truck rod-end yoke
orientation shown.
Temperature Drift
50
°C(122°F)
0.5°, 3.9mm @ 1 min
5
°, 39 mm @ 10 min
Loosen
capscrew.
Turn to adjust.
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