Upright SL26SL Service Manual page 36

Service and Repair
4. Loosen the locknuts on Counterbalance Valves.
5. With the machine fully powered up depress the DRIVE button on the upper control box, depress the interlock lever
and slowly pull the control lever to REVERSE to drive the wheels.
6. Adjust the Forward Counterbalance Valve by turning the adjustment screw until the pressure gauge indicates 34.5
bar (500 psi).
7. Slowly push the Control Lever to FORWARD to drive the wheels.
8. Adjust the Reverse Counterbalance Valve by turning the adjustment screw until the pressure gauge indicates 34.5
bar (500 psi).
9. Check the settings by slowly moving the Control Lever FORWARD, then REVERSE, checking the gauge to ensure
pressures are properly set. Re-adjust as needed.
10. Tighten locknuts on valves to 8N-m (6 ft-lbs). Remove blocks and lower work platform to ground.
11. Remove the gauge from the gauge port and re-install cap.
12. Check for proper operation of the drive system and brake.
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1
1. Manual Brake
Release Pump
2. Brake Pressure
Reducing Valve &
Brake Shutoff
Fore/Aft Tilt Cylinder Relief Valve (CT4)
(Figure 0-4)
1. Operate the hydraulic system for five minutes.
2. Remove the quick disconnect plug and install a 0-100 bar (0-600 psi) pressure gauge.
3. Remove the plug from the end of the valve to expose the adjusting screw.
4. With the engine running, tilt the platform fully forward using the fore/aft level switch.
5. While holding the level switch forward, set the pressure to 13 bar (500 psi) maximum by slowly turning the
adjusting screw, clockwise increases pressure.
6. Replace the valve plug.
7. Remove the gauge and reinstall the plug.
8. Level the platform.
9.
Steering Relief Valve (Figure 0-4)
1. Remove the top steering hose from back of the manifold and replace it with a 0-250 bar pressure gauge.
2. Block the end of the hose with a cap fitting.
3. Remove the plug from the end of the valve to expose the adjusting screw.
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3
3. Test Port
Figure 0-5: Hydraulic Manifold Assembly, Front View