Setting Hydraulic Manifold Pressures - Upright TM12 Service Manual

Hydraulics
S
E T T I N G
C A U T I O N
!
The hydraulic fluid may be of sufficient temperature to cause burns. Wear safety gloves and protective
eye wear when handling hot fluid.
W A R N I N G
!
The fluid in the hydraulic system is under very high pressure which can easily cause severe cuts.
Obtain medical assistance immediately if cut by hydraulic fluid.
NOTE: Check the hydraulic pressures whenever the pump, manifold or relief valves have been serviced or replaced
M R
AIN ELIEF
1. Operate the hydraulic system 10 to 15 min-
utes to warm the fluid.
2. Remove the cap or loosen the locknut on
the main relief valve.
3. Install a 0-207 bar (0-3000 psi) pressure
gauge to the gauge port.
4. Turn the Chassis Keyswitch to CHASSIS
and elevate the machine fully.
5. While holding the Chassis Lift Switch to the
UP position, adjust the Main relief valve until
the pressure gauge reads 165 bar (2400
psi).
6. Release the Chassis Lift Switch.
7. Replace the cap, or tighten the locknut on
the lift relief valve, and torque to 8 N-m (6 ft.
lbs.).
8. Lower the platform.
Page 2-12
H M
Y D R A U L I C
!
!
V
ALVE
P
A N I F O L D R E S S U R E S
7
9
2
1
1. Steering Valve
Lift Valve
2.
Gage Port
3.
Depression Valve
4.
Forward/Reverse Valve
5.
Section 2 - Service and Repair
Figure 2-9: Hydraulic Manifold
8
6
5
3
10
4
Counterbalance Valves
6.
Steering Relief Valve
7.
Check Valve
8.
Flow Divider Valve
9.
Main Relief Valve
10.
107099-002 TM12 Work Platform