110 Hydraulic System
To adjust the proportional valve main relief pressure:
1. Secure the arm working area using safety tape or barricades.
2. Install a control lever on the arm in/out section of the proportional valve (see Figure 5-4).
3. Move the lever back and forth to remove any residual hydraulic pressure in the system.
4. Connect a 0–4000 PSI gauge to the quick coupler on the proportional valve (see Figure 5-20).
5. Start the engine and engage the hydraulic system.
6. Fully retract the arm using the lever.
7. While maintaining the arm in function active, adjust the main relief valve to 2000 PSI (± 50 PSI)
using the adjustment screw.
Turn the hex wrench clockwise to raise pressure or counterclockwise to lower pressure.
Arm down holding valve (to keep arm up) 800 ± 50 PSI
Arm extend System pressure
Arm retract System pressure
Warning!
Stay out of the path of the arm while manually moving the HELPING-HAND™.
Failure to do so may result in severe injury or even death.
Warning!
Make sure that the shut-off valve on the suction line is completely open before starting
the engine. Failure to do so may damage the hydraulic system.
Table 1 Hydraulic pressure table (cont’d)
Function Pressure setting
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