HYDRAULIC SYSTEM SERVICE MANUAL 1400A
2-10 1-21-2019 Control # 104-07
Relief Valve Setting Procedures
Insert a T-connector with a pressure gauge in the hydraulic
line at swivel port #3. This can be use to adjust all pressure
settings.
Hoist
NOTE: The hoist hydraulic circuit relief is set by the system
relief valve on the main control valve.
1. Disconnect the two work port hoses at the hoist motor
(Figure 2-3) and cap the hoist motor ports.
2. Plug the hoses.
3. Start the engine and set the throttle to governed rpm.
4. Try to hoist up or down. Adjust the system relief valve on
the main control valve to 26,200 ±689 kPa (3,800
±100 psi).
5. Shut down the engine.
6. Reconnect the hoses to the hoist.
Boom Lift
1. Start the engine and set the throttle to governed rpm.
2. Boom down until the boom bottoms out.
3. Set the boom down relief valve on the main control valve
(Figure 2-2) to 25,165 ±689 kPa (3,650 ±100 psi).
4. Boom up until the boom stops or stop the engine,
disconnect and cap the boom up hydraulic line.
5. Set the boom up relief valve on the main control valve
(Figure 2-2) to 24,821 ±689 kPa (3,600 ±100 psi)
6. Shutdown the engine.
7. Reconnect the boom up hydraulic line to the lift cylinder.
Valve To Be Set
Pressure Setting
kPa (PSI)
Tolerance kPa (PSI) Adjustment Location
Telescope Retract Relief 15,513 (2,250) ±689 kPa (100 psi) Main Control Valve
Telescope Extend Relief 18,615 (2,700) ±689 kPa (100 psi) Main Control Valve
Hydraulic Remote Controller Load Sense Pilot 23,442 (3,400) ±689 kPa (100 psi) Main Control valve
Outrigger Relief (Flow Control Valve) 20,684 (3,000) ±689 kPa (100 psi) Front Outrigger Box
Boom Up Relief 24,821 (3,600) ±344 kPa (50 psi) Main Control Valve
Boom Down Relief 25,165 (3,650) ±689 kPa (100 psi) Main Control Valve
Hoist Relief (System Relief Valve) 26,200 (3,800) ±689 kPa (100 psi) Main Control Valve
Front Stabilizer Extend 3,447 (500) ±689 kPa (100 psi) Port Block on Front Stabilizer
Front Stabilizer Retract 12,065 (1,750) ±689 kPa (100 psi) Port Block on Front Stabilizer
FIGURE 2-3
Work Port Hoses
Fo
r
Reference
Only
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