Model 5200 High-Level Orderpicker
Section 7. Component Procedures
Hydraulic Components
Lift Pressure Relief Valve Adjustment
Lift Pressure Relief Valve Adjustment
b. To increase pressure, turn the adjusting screw clockwise. To decrease pressure, turn the adjusting screw counterclockwise.
1. Install a calibrated pressure gauge [3000 psi (20,682 kPa) at mid-range] in the lift pressure test port (G1). See Figure 7-165.
c. Tighten the lock nut on the lift pressure relief valve.
Test Port (G1)
9. Check the pressure again. If the value has changed, repeat this procedure until the correct pressure reading is obtained. 10. Turn the key switch OFF and disconnect the battery. 11. Disconnect the pressure gauge and reinstall the cap on the lift pressure test port (G1).
Relief Valve (Rel-1) 7
Figure 7-165. Adjusting Lift Pressure
2. Loosen the lock nut on the lift pressure relief valve (REL-1) and back out the high-pressure relief. 3. Make sure the emergency lower valve is closed. 4. Place a maximum rated load + 200 lb. (90.7 kg.) on the forks. 5. Start the lift system and turn the pressure relief screw clockwise until the platform starts to lift. Note the pressure required when the platform starts to elevate. On three-stage lift trucks, continue lifting until the third stage of the mast starts lifting. Record the pressure reading. 6. Lower the operator platform and remove the load. 7. Chain the mast sections together and lift or lift the operator platform until the upper limit is reached. 8. To adjust the pressure: a. Continue trying to elevate, and turn the lift pressure adjusting screw (at REL-1) to obtain a pressure reading of 100 to 300 psi (689 to 2068 kPa) greater than that required to lift maximum rated load (value recorded is step 5).
Publication Number: 1043922B, Revised: 2 Sept 2015
7-87
