G&B Specialties Inc.
535 West 3
rd
Street, Berwick, PA, USA Tel: 1-570-752-5901 Fax: (570) 752-639
5.0
H
YDRAULIC
S
YSTEM
R
ELIEF
V
ALVE
S
ETTING
This system is equipped with one relief valve located on the railgear pump. The relief
valve will require adjustment at installation and if ever there appears to be inadequate
hydraulic pressure to operate the railgear. Refer to figure 3-14 throughout the following
adjustment procedure.
1.
Locate the hydraulic hose (Item 1) that supplies the blind end (the end opposite the
rod end) of the front railgear hydraulic cylinder from the pump pressure port and
disconnect it from the pump.
2.
Install a hydraulic pressure gauge (up to 3000 PSI) (Item 2) between the disconnected
hydraulic hose and the pump pressure port. The pressure gauge will indicate the
relief valve (Item 3) setting when the pump is loaded.
3.
Raise the front railgear completely. Push the “Up” button on the front control box so
that the hydraulic cylinder creates a load on the pump by trying to “dead-head”. The
pump should start and the pressure reading on the pressure gauge should climb to
1800 PSI.
4.
If the pressure is not correct, release the front control and adjust the relief valve on
the pump accordingly. Loosen the lock nut and turn the allen head screw in to
increase the pressure or out to decrease the pressure.
5.
Once the correct pressure on the pump relief valve is obtained, ensure the lock nut on
the relief valve is tightened. Release the pressure in the system and remove the
pressure gauge. Re-connect all hydraulic hoses.
Summary of Contents for R-150
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