Upright SL26SL Service Manual page 35

0.7 S H
ETTING YDRAULIC
Referring to Figure 0-1 along with the other Figures will aid in the following procedures.
Note: Check the hydraulic pressures whenever the pump, manifold, or relief valve(s) have been ser-
viced or replaced.
W A R N I N G
!
The hydraulic oil may be of sufficient tempera-
ture to cause burns. Wear safety gloves and
safety glasses when handling hot oil.
The oil in the hydraulic system is under very
high pressure which can easily cause severe
cuts. Obtain medical assistance immediately if
cut by hydraulic oil.
Main Relief Valve (Figure 0-4)
1. Operate the hydraulic system 10 to 15 minutes to warm the oil.
2. Remove the cap or loosen the locknut on the Main Relief Valve.
3. Install a 0-250 bar (0-3000 psi) pressure gauge to the gauge port.
4. Select LIFT mode and elevate the machine fully.
5. While holding the Chassis Lift Button, adjust the Main Relief Valve until the pressure gauge reads 172 bar (2500
psi).
6. Release the Chassis Lift Button.
7. Replace the cap, or tighten the locknut on the Lift Relief Valve, and torque to 8N-m (6 ft-lbs).
8. Lower the platform.
2
1. Main Relief Valve
2. Overcentre Valves
3. Lift Coil
Counterbalance Valves (Figure 0-4)
1. Operate the work platform for 10-15 minutes to bring the hydraulic oil up to normal operating temperature.
2. Remove the gauge port cap and install the pressure gauge assembly.
3. Using two 1-ton jack stands and a 2-ton jack, jack the work platform up to raise the rear wheels off the ground and
block the machine securely.
P
RESSURES
3 1
4
4. Steering Relief
Valve
5. Test Port
Figure 0-4: Hydraulic Manifold Assembly, Front View
!
5
Service and Repair
3-9