Wabtec R-150, Installation Manual

Page: 83 / 106

G&B Specialties Inc. 535 West 3
rd
Street, Berwick, PA, USA Tel: 1-570-752-5901 Fax: (570) 752-639
6.0 E
LECTRICAL
S
YSTEM
T
ROUBLESHOOTING
The following basic tests can be performed to check the integrity of the railgear electrical
system. Refer to the electrical schematic in figure 3-15.
Should the railgear pump fail to operate, first check the fuse or the circuit breaker and all
wiring for shorts. Then the following tests can be performed.
1.
Pump motor solenoid shift test and voltage test (use a Volt-Meter in Volts-DC mode):
a) Disconnect the wire from the solenoid load terminal to the railgear pump motor.
b) Ensure the solenoid power terminal is connected to the positive terminal of the
battery and the solenoid base is properly grounded. There should be 12 VDC
between the solenoid power terminal and the solenoid base and 0 VDC between
the solenoid load terminal and the solenoid base.
c) Connect one end of a 14 gauge shunt wire to the solenoid switching terminal and
touch the other end to the solenoid power terminal. The solenoid should shift in
the housing producing a distinctive “click”.
d) With the shunt wire connected as above, the voltage between the solenoid load
terminal and the solenoid base should be 12 VDC.
e) If the solenoid does not “click” and/or the voltage measured above is not correct
then the solenoid is inoperative and must be replaced.
f) If the solenoid does ‘click’, and there is 12 VDC on the load terminal, then there
may be a fault in the wiring to the front and/or rear controls or with the control
switches themselves.
2. Pump motor solenoid resistance test (use Ohm-Meter):
a) Disconnect all wiring to the solenoid.
b) Connect an Ohm-Meter to the solenoid switching terminal and to the solenoid
base. The resistance should be about 20 Ohms.
c) Connect an Ohm-Meter to the solenoid load terminal and to the solenoid
switching terminal. The resistance should be infinite (open). Zero resistance with
this connection will indicate a shorted solenoid.
d) Connect an Ohm-Meter to the solenoid power terminal and to the solenoid
switching terminal. The resistance should be infinite (open). Zero resistance with
this connection will indicate a shorted solenoid.
e) If the solenoid resistances are not within specifications, the solenoid must be
replaced.
3.
Pump motor test:
a) Disconnect the wire from the pump motor power terminal.
b) Ensure the pump base is properly grounded.
c) Connect one end of a 4 gauge shunt wire to the pump motor power terminal and
touch the other end to the battery positive terminal.