Setting Hydraulic Pressures
Section 2 - Service and Repair
Page 2-12
104045-021 - AB62 Work Platform - European Model
2-6 S
ETTING
H
YDRAULIC
P
RESSURES
Figure 2-10: “Hydraulic Manifold,” on page 2-11 shows complete hydraulic manifold assembly.
NOTE:
Check hydraulic pressures whenever the pump, manifold, or any relief valve has been serviced or replaced.
H
I G H
P
R E S S U R E
R
E L I E F
V
A L V E
1. Operate the hydraulic system 10-15 minutes to warm the fluid.
2. Install a 0-207 bar (0-3000 PSI) pressure gauge to the pressure test port #3-using Part # 063965-002,
Quick Disconnect Adapter.
3. Retract boom completely.
4. While activating the boom retract function, set the pressure to 186 bar (2700 PSI) maximum by slowly
turning the adjusting screw. Turning the adjusting screw clockwise increases pressure; counterclock-
wise decreases pressure.
5. Remove the pressure gauge, and reinstall all plugs.
L
O W
P
R E S S U R E
R
E L I E F
V
A L V E
1. Operate the hydraulic system 10-15 minutes to warm the fluid.
2. Install a 0-207 bar (0-3000 PSI) pressure gauge to the pressure test port.
3. Completely extend jib function.
4. Continue activating function and set the pressure to 97 bar (1400 PSI) by slowly turning the adjustment
screw. Turning the adjusting screw clockwise increases pressure; counterclockwise decreases pres-
sure.
5. Remove the pressure gauge, and reinstall all plugs.
C
O U N T E R B A L A N C E
R
E L I E F
V
A L V E S
1. If any counterbalance relief valve is faulty, completely lower the jib, and retract the boom.
2. Replace or recalibrate the counterbalance valve.
3. Slowly cycle function related to replaced counterbalance valve several times to remove air from the sys-
tem.