April 2017
Service and Repair Manual
Manifolds
Part No. 1272854
GTH-844
57
7-5
Valve Adjustments - Secondary
Function Manifold
How t o Set t he Steer Syst em Pres sur e
How to Set the Steer System
Pressure
Note: Be sure that the hydraulic oil level is visible in
the inspection glass of the hydraulic tank.
1
Install a 0 to 1000 psi / 0 to 100 bar pressure
gauge into test port 'TP' at the top of the
secondary function manifold, refer to
Secondary Function Manifold Components.
2
Start the engine. Allow the engine to idle after
warming the engine to operating temperature.
3
Without operating any machine controls,
observe the reading on the pressure gauge.
Result: The pressure gauge reads 450 ±25 psi
/ 31 ±1.7 bar. The pump is functioning
correctly.
Result: The pressure gauge fails to read 450
±25 psi / 31 ±1.7 bar. The pressure setting
needs to be adjusted. Refer to Repair
Procedure,
How to Adjust the Function Pump
Pressure
.
4
Turn the machine off. Remove the pressure
gauge from the test port.
Bodily injury hazard. Spraying
hydraulic oil can penetrate and
burn skin. Loosen hydraulic
connections very slowly to allow
the oil pressure to dissipate
gradually. Do not allow oil to
squirt or spray.
5
Install a 0 to 3500 psi / 0 to 250 bar pressure
gauge into test port 'TS' at the top of the
secondary function manifold. Refer to
Secondary Function Manifold Components.
6
Start the engine. Allow the engine to idle.
7
Fully turn and hold the steering wheel in the left
direction and allow the wheels to fully turn to
the left. Continue holding the steering while
observing the pressure reading on the
pressure gauge.
Result: The pressure gauge reads
2650 psi±50 psi / 183±3.4 bar. The pressure
setting is correct. Proceed to step 12.
Result: The pressure gauge fails to read
2650 psi±50 psi / 183±3.4 bar. The pressure
setting needs to be adjusted. Proceed to step
8.
8
Turn the machine off. Hold the steer pressure
reducing/relief valve with a wrench and
remove the cap (schematic item PR3).
9
Adjust the internal hex socket. Turn it
clockwise to increase the pressure or
counterclockwise to decrease the pressure.
Component damage hazard. Do
not adjust the relief valve
pressures higher than
specifications.
10 Install the relief valve cap.
11 Repeat this procedure beginning with step 6.
12 Turn the machine off. Remove the pressure
gauge from the test port.
Bodily injury hazard. Spraying
hydraulic oil can penetrate and
burn skin. Loosen hydraulic
connections very slowly to allow
the oil pressure to dissipate
gradually. Do not allow oil to
squirt or spray.
Summary of Contents for GTH-844
Page 12: ......
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Page 151: ...April 2017 Service and Repair Manual 139 Harness Map Options Work Lights to 15 21456...
Page 155: ...April 2017 Service and Repair Manual 143 Harness Map Options Road Lights to 15 21456...
Page 159: ...April 2017 Service and Repair Manual 147 Harness Map Options Enclosed Cab with Heater...
Page 162: ...Service and Repair Manual April 2017 150 Harness Map Options Enclosed Cab with HVAC...
Page 163: ...April 2017 Service and Repair Manual 151 Electrical Schematic View 1 to 15 20661...
Page 166: ...Service and Repair Manual April 2017 154 Electrical Schematic View 2 to 15 20661...
Page 167: ...April 2017 Service and Repair Manual 155 Electrical Schematic View 1 from 15 20662 to 21456...
Page 170: ...Service and Repair Manual April 2017 158 Electrical Schematic View 2 from 15 20662 to 21456...
Page 171: ...April 2017 Service and Repair Manual 159 Electrical Schematic View 1 from 15 21457 to 21535...
Page 174: ...Service and Repair Manual April 2017 162 Electrical Schematic View 2 from 15 21457 to 21535...
Page 175: ...April 2017 Service and Repair Manual 163 Electrical Schematic View 1 from 15 21536 16E 10000...
Page 178: ...Service and Repair Manual April 2017 166 Electrical Schematic View 2 from 15 21536 16E 10000...
Page 179: ...April 2017 Service and Repair Manual 167 Hydraulic Schematic Single Joystick to 19528...
Page 183: ...April 2017 Service and Repair Manual 171 Hydraulic Schematic Dual Joystick to 19528...