Upright TM12 Service Manual page 51

Section 2 - Service and Repair
C
OUNTERBALANCE
1. Operate the machine for 10-15 minutes to bring the hydraulic fluid up to normal operating temperature.
2. Block the rear wheels to prevent the machine from rolling.
3. Use a 1000 Kg (1 ton) capacity jack to raise the front wheels off the surface. Position blocks under the
machine to prevent it from falling if the jack fails.
4. Remove the gauge port cap and install a pressure gauge assembly.
5. Loosen the locknuts on the counterbalance valves.
6. With the Chassis Key Switch on DECK and the Drive/Lift Switch in DRIVE, engage the Interlock Lever
and slowly move the Control Handle to REVERSE to drive the wheels.
7. Adjust the forward counterbalance valve by turning the adjustment screw until the pressure gauge indi-
cates 83 bar (1200 psi).
8. Slowly move the Control Handle to FORWARD to drive the wheels.
9. Adjust the reverse counterbalance valve by turning the adjustment screw until the pressure gauge indi-
cates 83 bar (1200 psi).
10. Check the settings by slowly moving the Control Handle to FORWARD, then to REVERSE, checking the
gauge to ensure pressures are properly set. Re-adjust as needed.
11. Tighten the locknuts on the valves to 8 N-m (6 ft. lbs.). Remove the blocks and lower the machine to the
surface.
12. Remove the gauge from the gauge port and re-install the cap.
13. Check for proper operation of the drive system and brake.
S
TEERING
1. Operate the machine for 10-15 minutes to bring the hydraulic fluid up to normal operating temperature.
2. Install a pressure gauge in the gauge port.
3. Loosen the locknut or remove the cover on the steering relief valve and turn the adjusting screw counter-
clockwise two full turns.
4. While one person holds the Steering Switch to steer RIGHT or LEFT, slowly turn the steering relief valve
adjusting screw clockwise to increase the pressure until the gauge reads 69 bar (1000 psi).
5. Tighten the locknut or replace the steering relief valve cover and torque to 8 N-m (6 ft. lbs.).
6. Remove the gauge and replace the cap.
107099-002 TM12 Work Platform
V
ALVES
R V
ELIEF ALVES
Hydraulics
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