JLG M4069 ANSI Service Manual - Manual (Page 92)

SECTION 4 - HYDRAULICS
4-20 – JLG Lift – 3121122
4.15 PRESSURE SETTING PROCEDURES
Main Relief at Pump
1. Install pressure gauge at port “MP” on control valve.
2. Remove the plug from the lift coil.
3. Activate and bottom out Lift Up. Adjust Main Relief to
3000 psi (207 bar).
4. Replace the plug on the lift coil.
Lift Relief
1. With pressure gauge at “MP” port on control valve,
activate and bottom out Lift Up.
2. Adjust Lift Relief to 2500 psi (172 bar) on the M3369/
3369LE and 2800 psi (193 bar) on the M4069/
4069LE.
Steer Relief
1. With pressure gauge at “MP” port on control valve,
activate and bottom out Steer Left.
2. Adjust Steer Relief to 2500 psi (172 bar).
3. Repeat step one activating Steer Right.
4. Shut down hydraulic system and remove pressure
gauge.
NOTE: On the back of the control valve is a flow control
valve. This valve is used to adjust the lift down
speed.
Table 4-4. Valve Component Torque Values
COMPONENT Ft lb Nm
Main Relief 25 35
Lift Relief 25 35
Steer Relief 20 28
Pressure Switch 12 16.8
Brake 20 28
High Pressure Filter 50 70
Steer 20 28
Lift 25 35
Flow Control 25 35
Coil Nuts 7 9.8