Section 4 • Repair Procedures
March 2015
4 - 40
GTH-1048 • GTH-1056
Part No. 123701
c
b
a
How to Adjust the Function Pump
Pressure Compensator
Note: Two people will be required to perform this
procedure.
1 Connect a 0 to 5000 psi / 0 to 350 bar pressure
gauge to test port 'TP' on the primary function
manifold (schematic item AAA or BZ). See 7-1
or 7-2,
Primary Function Manifold Components.
2 Start the engine and allow the engine to run at
low idle.
3 Fully retract the boom.
4 Continue to activate the boom retract function
and observe the pressure reading on the
pressure gauge.
Result: The pressure gauge reads
3190±50 psi / 220±3.4 bar. The pump is
functioning correctly. Proceed to step 7.
Result: The pressure gauge fails to read
3190±50 psi / 220±3.4 bar. The pressure
setting needs to be adjusted. Proceed to step 5.
5 Loosen the set screw for the pressure
compensator adjustment screw.
6 Adjust the pressure compensator pressure.
Turn the adjustment screw clockwise to
increase the pressure or counterclockwise to
decrease the pressure. Tighten the set screw.
Component damage hazard. Do
not adjust the pressure
compensator higher than
specified.
HYDRAULIC PUMP
a
pressure compensator adjustment screw
b
set screw
c
hydraulic supply line (from tank)
7 Turn the engine off and remove the pressure
gauge.
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-1048
Page 6: ...May 2015 GTH 1048 GTH 1056 Part No 123701 vi This page intentionally left blank ...
Page 174: ...Section 6 Schematics May 2015 6 11 Harness Map Control System Power Single Joystick 6 12 ...
Page 177: ...May 2015 Section 6 Schematics 6 14 Harness Map Control System Ground Single Joystick 6 13 ...
Page 178: ...Section 6 Schematics May 2015 6 15 Harness Map Control System Power Dual Joystick 6 16 ...
Page 181: ...May 2015 Section 6 Schematics 6 18 Harness Map Control System Ground Dual Joystick 6 17 ...
Page 190: ...Section 6 Schematics May 2015 6 27 Harness Map Options Work Lights 6 28 ...
Page 193: ...May 2015 Section 6 Schematics 6 30 Harness Map Options Road Lights 6 29 ...
Page 194: ...Section 6 Schematics May 2015 6 31 Harness Map Options Enclosed Cab with Heater 6 32 ...
Page 197: ...May 2015 Section 6 Schematics 6 34 Harness Map Options Enclosed Cab with HVAC 6 33 ...
Page 210: ...Section 6 Schematics May 2015 6 47 Hydraulic Schematic Models with Single Joystick 6 48 ...
Page 213: ...May 2015 Section 6 Schematics 6 50 Hydraulic Schematic Models with Dual Joystick 6 49 ...
Page 214: ......