OP-755 Part 2 Pages 197-401 - Personal Page of GENE SLOVER

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307
The solenoids in the valve block assembly do
not function to shift the venting valve or
the power failure valve.
Remove the inspection cover from the
solenoid housing and examine the solenoids
to see if, they operate to shift
the venting valve, when the starting
handle is moved to the ItStart It position.
Also check to see that the power failure
valve shifts whenthe electric motor is
turned off and on.
(4) The venting valve or the power failure valve
stuck.
Operate the valves manually by moving
their operating levers_ inside of the
solenoid housing to insure that no friction
exists Lnthe valves, and the valve
springs function .correctly.
(5) The starting sv.itch fails to close or make
contact.
Remove the cover of the starting switch
and check to see if the contacts close
when the starting handle is moved to
theltStartlt Position.
(6) The loading and unloading position limit
switches fail to close or make contacts.
Remove the covers of the switches which
are not held open by the powder car and
check to see that the switches are
closed, and the contacts in good condition.
(7) The wiring maybe ruptured or a short circuit
may exist.
Check the wiring for rupture or short
circuit.
(b) Failure of control pump circuit. - If pressure
builds up to operate the hoist with the control
selector lever positioned for a nServo Mechanical"
controlled cycle, but considerable effort
is required to operate the hoist and lower control
lever, the control pumphas failed. The
trouble may be caused by one of the following
reasons:-