GMS SERIES
OM-04386
PAGE D-4
TROUBLESHOOTING
PREVENTIVE MAINTENANCE
Since pump applications are seldom identical, and
pump wear is directly affected by such things as
the abrasive qualities, pressure and temperature
of the liquid being pumped, this section is intended
only to provide general recommendations and
practices for preventive maintenance. Regardless
of the application however, following a routine pre
ventive maintenance schedule will help assure
trouble‐free performance and long life from your
Gorman‐Rupp rotary gear pump. For specific
questions concerning your application, contact
your Gorman‐Rupp distributor or the Gorman‐
Rupp Company.
Record keeping is an essential component of a
good preventive maintenance program. The ap
pearance of wearing parts should be documented
at each inspection for later comparison. Also, if re
cords indicate that a certain part (such as the seal)
fails at the same duty cycle, this part can be
checked and replaced before failure occurs.
Because of the tight tolerances within your rotary
gear pump, wear between rotating parts is normal
and expected. For new applications, a first inspec
tion at 250 hours will give insight into the wear rate
for your particular application. Subsequent inspec
tions should be performed at regular intervals of
2000 hours. Critical applications should be in
spected more frequently.
Check the thrust washer, idler bushing, idler pin,
idler assembly, shaft bushing and rotor/shaft as
sembly at each inspection. Wear patterns should
be uniform, without evidence of deep or irregular
grooves.
For packing pumps, periodic adjustment of the
packing is required to keep leakage to a minimum
(see the adjustment procedure described under
Leakage
in
Operation, Section C
). Do not over
tighten. Replace the packing if leakage cannot be
reduced by a slight adjustment.
After extended service, adjustment of the clear
ance between the rotor and the head will normally
improve performance (see the adjustment proce
dure in
Maintenance And Repair, Section E
).
If the pump is to be removed from service for repair,
be sure to protect the internal components from
rusting while the pump is disassembled and after
reassembly if not immediately placed back into
service.
