Service manual

24
H. TROUBLESHOOTING (Continued)
MALFUNCTION POSSIBLE CAUSE REMEDY
Excessive or Unusual
Noise or Vibration
Misalignment
Check pump and driver alignment and
correct as required.
Restricted suction line
Check suction line and remove any
obstructions.
Air in system
Insure pump is vented and suction lines
are full of liquid. Check reservoir level.
Fill as necessary. Check all lines,
flanges, joints and connections for
leakage. Repair as necessary.
Dirty suction strainer
Clean suction strainer or filter element.
Relief valve chatter or
leakage
Check discharge relief valve pressure
setting. Re-adjust, repair or replace relief
valve.
Heavy internal rubbing of
pump parts
Verify pump and driver alignment.
Inspect pump wearing parts. Replace as
required.
Mechanical problem
Check for loose or mis-positioned
coupling, bent or broken shafts, or worn
bearing. Repair or replace as required.
Rapid Pump Wear
Fluid contains abrasive
foreign matter
Collect samples of liquid and test for
foreign matter. Reduce downstream filter
ratings in re-circulating systems (do not
exceed NPIPR). If necessary, replace
liquid in re-circulating systems.
Fluid contains water
Remove any water from reservoir. Find
source and prevent further ingestion.
Misalignment
Check pump and driver alignment.
Correct as required.
Insufficient liquid
Check liquid level in reservoir and correct
as required. Remove any suction line
obstructions. Clean/replace strainer or
filter element.
Excessive Power Usage
Fluid more viscous than
specified
Heat fluid to proper viscosity and/or
design temperature.
Pump suction and/or
discharge lines closed or
blocked
Insure suction and discharge lines are
open, and remove obstructions if present.
Heavy internal rubbing of
pump parts
Verify pump and driver alignment.
Inspect pump wearing parts. Replace as
required.
Excessive pump speed
Reduce pump speed to design limits.
Mechanical problems
Check for bent shaft, tight shaft parking,
or pipe strain. Repair or replace as
required.