JLG X14JH Operator Manual User Manual

Page 87

5. TROUBLESHOOTING

BOOM LIFT MODELS X14JH

JLG

X14JHR0220311

PROBLEM

CAUSE

SOLUTION

The pump is very noisy

• The pump does not suck
• Worn pump
• The pump sucks air

• Replace pump

• Check oil level in the relative
tank

With the pump activated, the
oil does not reach the hydrau‑
lic system or arrives at a pres‑
sure too low to move the
machine

• See point 1
• Maximum pressure valves
not calibrated or dirty
• Worn maximum pressure
valves
• The solenoid protection
fuses of the solenoid power
valves are burnt‑out
• The hydraulic switch situa‑
ted under the column is faulty

• See point 1
• Calibrate again or clean the
maximum pressure valves
• Replace maximum pressure
valves
• Replace the control solenoid
of the emergency solenoid val‑
ves
• Clean or replace the emer‑
gency solenoid valves
• Replace solenoid fuses

Once the equipment is stabi‑
lised, you cannot detach the
overhead part from the sup‑
ports at rest

• See point 2
• The solenoid of the emer‑
gency solenoid valves does not
get excited (only movement of
the overhead part)
• The stabiliser microswitches
do not close the contact

• See point 2

• Regulate the microswitches
on the stabilisers

The machine superstructure
does not hold the working
platform with the rated load
on board

• Locking valves dirty or
faulty

• Dismantle and clean the
locking valves on the jacks
that hold the load

When working with the
overhead part, the machine
stops

• Accidental pressing of the
emergency pushbutton
• The general protection fuse
of the electric system is burnt‑
out
• The load cell has been acti‑
vated

• Put back the pressed push‑
button to neutral position
• Replace the general protec‑
tion fuse

• Unload the machine