© Mitsubishi Forklift Trucks 2013. All © Mitsubishi Forklift Trucks 2013. All rights reserved.rights reserved. Revision: BRevision: B
Document ID: 615023Document ID: 615023
133 (244)133 (244)
PBV20N2 PBV20N2 Service Service ManualManual
The principle of the truck’s hydraulic operation is as The principle of the truck’s hydraulic operation is as follows:follows:
Lifting:Lifting:
1. 1. The The electrical electrical motor omotor operates perates the hydthe hydraulic graulic gear puear pump.mp.
2. 2. The The hydraulic hydraulic fluid fluid is is pressurized.pressurized.
3. 3. The fluid The fluid pressure is mpressure is maintained aintained using the using the relief valve, relief valve, which opewhich opens at a ns at a certaincertain
pressure. In such cases, the pressure. In such cases, the hydraulic fluid is returned to the fluid hydraulic fluid is returned to the fluid tank. The openingtank. The opening
pressure of the relief valve pressure of the relief valve is indicated in the hydraulic schematics.is indicated in the hydraulic schematics.
4. 4. The pressuThe pressurized hydraulrized hydraulic fluid flowic fluid flows through s through the no-return the no-return valve to thvalve to the liftinge lifting
cylinder.cylinder.
5. 5. The The lifting lifting cylinder cylinder piston piston lifts lifts the the forks.forks.
Figure 80. Hydraulic fluid flow during liftingFigure 80. Hydraulic fluid flow during lifting
LoweringLowering
1. 1. The The solenoid solenoid valve valve is openis opened with ed with the lothe lowering wering switch.switch.
2. 2. The The hydraulic fluid hydraulic fluid flows flows through through the the 300300 μ sieve back to the fluid tank.μ sieve back to the fluid tank.
3. 3. As the hyAs the hydraulic pressudraulic pressure reduces, re reduces, the lifting the lifting cylinder piston cylinder piston retracts and retracts and the forksthe forks
are lowered.are lowered.
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