Vehicle System Testing and Adjusting 63
WARNING
Tilt cylinder pivot eyes can loosen if the torque
on the pivot eye clamping bolt is not tight
enough. This will let the tilt cylinder rod turn in
the tilt cylinder eye. The cylinder rod may then
twist our of the pivot eye and the tilt cylinder will
be out of alignment or may let the mast fall and
cause personal injury or damage. When the rod
lengths are made even, the tilt angle differences
or the mast alignment will no longer be a
problem.
3. Tighten bolt (2) and the nut to a torque of
...................................... 95±15N·m (70±10 lb·ft).
4. With mast at full back tilt, install shims (4) as
required to permit no gap between spacer (5) and
head (6). Shim so mast does not twist at full tilt
back.
Drift Test
Drift is movement of the mast or carriage that is
there sult of hydraulic leakage in the cylinders or
control valve. Before testing the drift:
WARNING
Personal injury can be caused by sudden
movement of the mast or carriage. Use
woodblocks and clamps to hold the mast in this
position. Keep hands and feet clear of any parts
that can move.
1. Check the chain adjustment and tilt cylinder
alignment and make necessary adjustments.
2. Lift the mast approximately 762 mm (30 in). Use
wood blocks and clamps to hold the mast in this
position.
3. Check the mast hinge bolts to make sure they are
tight.
4. Remove the blocks and clamps and lower the
mast.
Drift Test For Lift System
1. Secure a rated capacity load on the forks of the
lift truck. Operate the lift truck through a complete
lift and tilt cycle until the oil is at normal
temperature of operation, 45 to 55 °C (113 to
131 °F).
2. Put the mast in a vertical position. Raise a rated
capacity load to a sufficient height to test the lift
cylinders.
3. Measure any drift of the carriage for a ten minute
period. Drift for all models shall not exceed
100.0mm (4.00 in).
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