4-32
GTH-2506 GTH-3007
Part No. 57.4400.9220GT
August 2018
Section 4 • Repair Procedures
Manifold
7-1
Function Manifold
How to Test the Boom
Telescopic Cylinder Relief
Valve
1 Connect a 0 to 5000 psi / 0 to 350 bar pressure
gauge to port TP1 on the function manifold
(boom and steering functions hydraulic test
port).
2 Start the engine.
3 Increase the engine speed to maximum rpm.
4 Fully extend the boom without releasing the
joystick.
Result: the pressure gauge reads 1450 psi /
100 bar for GTH-2506 or 2030 psi / 140 bar for
GTH-3007. The pressure setting is correct.
Pressure is not within specification.
Adjust the high pressure relief valve "
a
" located
on the Function Manifold.
5 Turn the machine off. Remove the pressure
gauge from the test port.
a
