Platform Lift Up And Down Jerky; Platform Lift Up And Down Jerky - JLG 10VP Service And Maintenance Manual

Platform Lift Up And Down Jerky

Overview Of Procedure
The following procedure suggests areas on the machine which might attribute to erratic movement of the platform during lift
up and down.
Check For These Obvious Conditions First:
• If mast is not running smooth or has tight and rough spots, refer to the Mast Section Rebuild.
• Hydraulic oil level in reservoir tank at full level.
• Hydraulic oil no milky (presence of water), or not foamy (full of air).
STEP
CONTROLS (ELECTRICAL)
Is platform control, enable, up or down pad defective or worn out?
1.
2. Loose connections , ground and power.
Valve coils or solenoids keep opening and closing.
3.
4. Problem internal to the MC-1 control box.
HYDRAULIC
Are the hydraulic valves working properly.
5.
6. Pump drive cavitates.
Lift cylinder
7.
3120728
Table 3-27. Platform Lift Up and Down Jerky.
ACTION
– JLG Lift –
SECTION 3 - TROUBLESHOOTING
SPEC YES
— Replace pad
Repair
—
connection
Repair Connec-
— tion or Replace
Valve
— Replace box
— Replace Valve
— Replace Pump
Rebuild or
—
Replace Cylinder
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
—
3-37