Upright SB60 Service & Parts Manual page 31

3.11
3.11 Setting Hydraulic
Pressures
Figure (3-16,3-17) shows complete hydraulic mani-
fold assembly.
Note: Check hydraulic pressures whenever the
pump, manifold or any relief valve has been serviced
or replaced.
MAIN RELIEF VALVE
1. Operate the hydraulic system 10-15 minutes to
warm the oil.
2. Install a 0-3000 PSI pressure gauge to the pressure
testport.
3. Retract boom completely.
4. While activating the boom retract function, set the
pressure to 2700 PSI (186 bar) maximum by slowly
turning the adjusting screw. Turning the adjusting
screw clockwise increases pressure and counter-
clockwise decreases pressure.
5. Remove the pressure gauge and reinstall all plugs.
OTHER RELIEF VALVES
1. Operate the hydraulic system 10-15 minutes to
warm the oil.
2. Install a 0-3000 PSI pressure gauge to the pressure
testport.
3. Completely extend function to be checked.
4. Continue activating function and set the pressure
by slowly turning the adjusting screw until the
correct pressure reads on the pressure gauge.
Turning the adjusting screw clockwise increases
pressure and counterclockwise decreases pressure.
5. Remove the pressure gauge and reinstall all plugs.
COUNTERBALANCE RELIEF
V A L V E S
1. If any counterbalance relief valve is faulty, com-
pletely lower the jib, and retract the boom.
2. Replace or recalibrate the counterbalance valve.
3. Slowly cycle function related to replaced counter-
balance valve several times to remove air from
system.
SB60 Work Platform
Maintenance
Section
3.11
3-17