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2.3 Hydraulic System Fault Diagnosis and Correction
Fault Possible reasons Corrective action
No oil output from the
oil pump
Low oil level in the fuel tank Fill to the specified oil level
Filter clogged
Clean the oil circuit and fuel tank. If the hydraulic oil
is dirty, replace it
Low oil pump output
pressure
Bearing wear; Damaged retainer
and O-ring
Replace faulty parts
Safety valve adjustment error Use a pressure gauge to increase the pressure
Air in the oil pump
Add hydraulic oil to the fuel tank and wait for the
bubbles to disappear before using the oil pump
Oil pump emits noise
Cavitation due to filter screen
blockage
Adjusting or replacing hoses and cleaning filters
Cavitation caused by high
viscosity of hydraulic oil
Replace with new hydraulic oil with viscosity
suitable for the operating speed of the oil pump,
and only operate when the oil temperature is
normal
Bubbles in hydraulic oil
Check the cause of bubbles first, and then take
measures
Fork
cannot
rise
Gear pump
has action
Blocked or damaged oil circuit Repair or replace
Gear pump
no action
Loose or damaged lifting
micro-switch
Resecure or replace
Motor or circuit failure Overhaul
Fork does not lower
The solenoid valve is blocked or
damaged
Repair or replace
The pressure of the
safety valve is
unstable or cannot be
adjusted
Loose pressure regulating screw Adjust the pressure again and lock it tightly
The pressure regulating spring is
deformed or damaged
Replace
Worn or stuck safety valve core Replace or disassemble and reassemble
Pump failure Maintenance pump
3 Electrical system
The electrical system of this car is a dual wire system, and all circuits are not grounded. The
working voltage of the entire vehicle circuit is DC24V.
1. Handle assy.
2. Controller
3. Drive unit assy.
4. Key switch assy.
5. Emergency stop switch
6. Hydraulic unit assy.
7. Charger
8. Batteries
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