Mast Noisy When Lifting And Lowering; Mast Noisy When Lifting And Lowering - JLG 10VP Service And Maintenance Manual

SECTION 3 - TROUBLESHOOTING

Mast Noisy When Lifting And Lowering

Overview Of Procedure
This procedure examines components of the mast itself and as well as it's lifting components for dirt, debris, proper lubrica-
tion and operation.
STEP
1. Do slide pads and slide pad channels need to be cleaned of dust,
dirt, or other debris?
2. Do chain/cables need to be lubricated per JLG specification in the
Service Manual?
Are the chain/cable sheave wheels dry and need lubrication?
3.
Note: Plastic wheels will howl on the sheave pin when they are dry.
Sheave wheels may seize to the sheave pin and the pin may turn in
the pin retainer blocks.
4. Are the sequence cables (located on the side of mast) chattering
when the springs are compressed?
Note: This noise is normal at the sequence cable sheave wheels
when the mast is completely lowered. However if the sequence
cable chattering is happening no matter what position the mast is in,
it could be a result of the mast being shimmed to tight or dirt and
debris in the slide pad channels causing the mast to be tight.
Is the bore of the lift cylinder dry?
5.
6. Are the bearings in the lift pump motor and pump drive worn?
7. Are the hydraulic lines vibrating together?
Check if the pump motor is loose to it's mounting plate.
8.
Hydraulic oil could be cavatating inside the pump.
9.
3-38
Table 3-28. Mast Noisy when Lifting and Lowering.
ACTION
– JLG Lift –
SPEC YES
Clean Pads and
—
Channels
Lubricate as
—
Required
Lubricate or
— Replace Sheave
Pins and Wheels
Clean Slide Pads/
Channels or Re-
—
shim Mast per
Service Manual
Replace Packing
—
or Lift Cylinder
Repair or Replace
—
Pump
Adjust the Posi-
—
tion of the Lines
Tighten pump
— mounting
fasteners
Repair or Replace
—
Pump
NO
Go to Step 2
Go to Step 3
Go to Step 4
Go to Step 5
Go to Step 6
Go to Step 7
Go to Step 8
Go to Step 9
—
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