Table 4-1. Troubleshooting - continued
PROBLEM
POSSIBLE CAUSE
REMEDY
Low pressure
5. Relief valve stuck,
Clean, and adjust relief valve, check for
partially plugged or
worn and dirty valve seats.
improperly adjusted,
valve seat worn.
6. Inlet suction strainer
Clean. Use adequate size. Check more
clogged or improper
frequently.
size.
7. Worn piston assembly.
Install proper filter. Suction at inlet
Abrasives in pumped
manifold must be limited to lifting
fluid or severe cavi-
less than 20 feet of water or -8.5 PSI
tation. Inadequate
vacuum.
water supply.
8. Fouled or dirty inlet
Clean inlet and discharge valve assem-
or discharge valves.
blies.
9. Worn inlet or dis-
Replace worn valves, valve seats and/or
charge valves or
discharge hose.
leaky discharge hose.
Pump runs extremely
1. Restricted inlet or air
Proper size inlet plumbing; check for
rough, pressure very
entering the inlet
air tight seal.
low.
plumbing.
2. Inlet restrictions and/
Replace worn cup or cups, clean out
or air leaks. Damaged
foreign material, replace worn valves.
cup or stuck inlet or
discharge valve.
3. Worn inlet manifold
Replace worn seals.
seals.
4. Worn inlet seals allow
Install new inlet manifold seals.
pump to draw air.
Cylinder O-rings
1. Pressures in excess of
Check for plugged nozzle, closed valves
blown next to dis-
rated PSI.
or improperly adjusted by pass valve.
charge manifold
2. Warped manifold.
Replace manifold.
Leakage at the
Loose cylinders. Cylinder
Remove spacer shims on manifold studs.
cylinder O-rings
motion caused by impro-
Do not remove too many shims or the
at the discharge
per shimming of the dis-
ears of the manifold will be bowed when
manifold and black,
charge manifold.
the manifold is retightened, causing
powdery substance
looseness in the center cylinder.
in the area of the
O-rings
4-7
