JLG 660SJ Service Manual - Manual (Page 176)

SECTION 5 - HYDRAULICS
5-44 – JLG Lift – 3120840
Platform Level
1. Install pressure gauge at quick disconnect on port
M3 on main valve.
2. With the aid of an assistant, activate platform level
forward.
3. While monitoring pressure gauge, adjust platform
level relief to 193 Bar.
4. Install pressure gauge at quick disconnect on port
M4 on main valve.
5. With the aid of an assistant, activate platform level
backward.
6. While monitoring pressure gauge, adjust platform
level relief to 124 Bar.
Articulating Jib Boom (If Equipped)
1. Install pressure gauge at quick disconnect on articu-
lating valve.
2. With the aid of an assistant, activate articulating jib
up.
3. While monitoring pressure gauge, adjust articulating
jib up relief to 103 Bar.
4. With the aid of an assistant, activate articulating jib
down.
5. While monitoring pressure gauge, adjust activate
articulating jib down relief to 83 Bar.
4 Wheel Steer (If Equipped)
1. At the platform console using the steer select switch
activate " 2 wheel steer".
2. Install a pressure gauge in port MP on main control
valve.
3. With the aid of an assistant, activate steer left and
right, adjust front steer relief valve to 172 Bar. This
pressure only affects the front axle.
4. At the platform console using the steer select switch
activate “crab” or “coordinated” steer.
5. At the main control valve block disconnect the wire
din connectors on the front steer valve. When steer
is activated only the rear steer will work.
6. Install a pressure gauge in port MP on main control
valve.
7. With the aid of an assistant, activate steer left and
right, adjust rear steer relief valve to 172 Bar. Read-
ing at the valve bank 172 Bar will give you 138 Bar at
the cylinders.
8. Re-connect the front steer din connectors at the
valve bank.
Figure 5-40. Articulating Jib Boom Pressure
Adjustments