MIO-H29RRXS004270 Rev D
G&B Specialties Inc. 535 West 3
rd
Street, Berwick, PA, USA Tel: (570) 752-5901 Fax: (570) 752-6397
US Field Service: 570-441-6988; CAN Field Service 570-854-0482; www.rafna.com
-17-
H
YDRAULIC
S
YSTEM
R
ELIEF
V
ALVE
S
ETTING
This system is equipped with one relief valve located on the railgear pump body next to the
emergency hand pump. This relief valve protects the entire hydraulic system from over
pressurization. The relief valve will require adjustment at installation and if ever there appears
to be inadequate hydraulic pressure to operate the railgear.
1.
Disconnect the hydraulic hose from the “P” port of the pump.
2.
Install a hydraulic pressure gauge (up to 3000 PSI) between the disconnected hydraulic hose
and the pump port. The pressure gauge will indicate the relief valve setting when the pump
is loaded.
3.
Following the procedure in the Railgear Kit Operation, Service and Parts manual, raise the
front railgear completely and continue to raise the railgear so that the hydraulic cylinder
creates a load on the pump by trying to “dead-head”. The pressure reading on the pressure
gauge should climb to 1800 PSI.
4.
If the pressure is not correct, release the railgear controls and adjust the relief valve on
the pump accordingly. Loosen the lock nut and turn the setscrew in to increase the pressure
or out to decrease the pressure. Re-check 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.
6.
Ensure the railgear is properly raised as per the Railgear Kit Operation, Service and Parts
manual.
