Load Drops Slightly - (Tilt And Hoist Cylinders Control Valve Plunger In Neutral)

UPRIGHTS

TROUBLESHOOTING

CAUSE

REMEDY

2. Damaged hoist cylinder.

2. Repair or replace cylinder.

3. Latching mechanism in wrong position, defective or

3. Check and change position of latching mechanism as

will not release

necessary. During free-lift: The inner latch should be

locking the outer latch in position; the rear latch should

engage the allen-head screw on the upper crossmember

of the outer upright. Check entire mechanism for sheared

pins, broken screws, worn bushings and maladjustment.

Rotate inner latch by hand. The latch should return to rest

position quickly, when released, if it does not, the shaft is

binding or the spring has not enough tension. Repair

latching as necessary.

NOTE

Generally, there is no latch-to-latch contact made throughout the entire lifting and lowering

sequence. However, due to binding under certain conditions, the inner upright may attempt to

move out of phase. This is prevented by the latching mechanism and at this time there is a latch-

to-latch contact.

Inner Upright Will Not Raise At The End Of

The Free-Lift Stroke

1. Allen-head screw on the hoist cylinder and/or its

1. Replace. Check: The carriage load rollers for

mating latch broken

excessive binding; latching mechanism for freedom of

operation and worn bushings. Replace parts and adjust as

necessary to restore normal latch function,

Load Drops Slightly - (Tilt And Hoist Cylinders

Control Valve Plunger In Neutral

1. Scored check valve in control valve

1. Reseat check valve. Replace control valve parts as

necessary.

2. Oil by-passing tilt cylinder

2. Replace packing and other cylinder parts as necessary.

3. Oil leakage past plunger

Replace plunger or control valve assembly, if

necessary.

4. Oil leakage at hydraulic connections or

4. Tighten fittings. Replace fittings and/or mating

defective hoses

component or hoses as necessary.

B-193