August 2018
Part No. 57.4400.9220GT
GTH-2506 GTH-3007
4-35
Section 4 • Repair Procedures
MANIFOLD
How to Test the Function
Manifold
1 Connect a 0 to 5000 psi / 0 to 350 bar pressure
gauge to port TP1 (boom and steering
functions hydraulic circuit test port).
2 Start the engine.
3 Increase the engine speed to maximum rpm.
4 Moving the joystick, retract the boom.
Result: the pressure gauge reads 4060 psi /
280 bar. The pump is good.
Pressure is not within specification.
Adjust the main relief valve placed above the
manifold.