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page 71
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375 SE
800-00162
Pump not delivering fluid.
Insufficient pressure build-up.
Pump making noise.
Driven in the wrong direction of rotation.
Coupling or shaft sheared or disengaged.
Fluid intake pipe in reservoir restricted.
Fluid viscosity too heavy to pick up prime.
Air leaks at intake. Pump not priming.
Relief valve stuck open. (Models with
integral relief valve only).
Vane(s) stuck in rotor slot(s).
System relief valve set too low.
Complete loss of flow from pump.
Pump intake partially blocked.
Air leaks at intake or shaft seal (Oil in
reservoir would probably be foamy.)
Pump drive speed too slow or too fast.
Coupling misalignment.
The drive direction must be changed
immediately to prevent seizure. Refer to
section VI - D.
for proper ring position for each direction
of rotation.
Disassemble pump and check shaft and
cartridge for damage. (See section VI.)
Replace needed parts.
Check all strainers and filters for dirt and
sludge. Clean if needed.
Completely drain system. Add new
filtered fluid of proper
viscosity.
Check inlet connection to determine
where air is being drawn in. Tighten any
loose connections. Ensure fluid in
reservoir is above intake pipe opening.
Check minimum drive speed which may
be too slow to prime pump.
Disassemble pump and wash valve in
clean solvent. Return valve to its bore
and check for any stickiness. A gritty
feeling on valve periphery can be polished
with crocus cloth. Do no remove excess
material, round off edges of lands or try to
polish bore. Wash all parts and
reassemble pump.
Disassemble pump. Check for dirt or
metal chips. Clean parts thoroughly and
replace any damaged pieces. If needed
flush system and refill it with clean fluid.
Use a pressure gage ot correctly adjust
relief valve.
- A valve is tuck pien permitting free flow
to
tank.
- Broken inlet or pressure line.
- Actuator bypassing full flow. (Motor
valve
plate lift).
Servie intake strainers. Check fluid
condition and, if needed, drain, flush and
refill system.
Check inlet connections and seal to
determine where air is being drawn in.
Tighten any loose connections and
replace seal if needed. Ensure fluid in
reservoir is above intake pipe opening.
Operate pump at recommended speed.
Check for damage to shaft seal bearing or
other parts. Replace any damaged parts.
Realign coupled shafts.
TABLE 1 - TROUBLESHOOTING THE SYSTEM
TABLE 1 - TROUBLESHOOTING THE SYSTEM
TABLE 1 - TROUBLESHOOTING THE SYSTEM
TABLE 1 - TROUBLESHOOTING THE SYSTEM
TABLE 1 - TROUBLESHOOTING THE SYSTEM
SINGLE PUMP MAINTENANCE CONTINUED...
