| Pump runs slow or erratically |
| |
Possible Cause |
How to Check |
Solution |
| 1 |
Plugged liquid filter. |
- Bypass filter and see if normal pump operation resumes.
|
- Replace filter with new, properly pre-wetted filter.
|
| 2 |
Dried out liquid filter. |
- Bypass filter and see if pump operation resumes.
|
- Properly pre-wet filter.
|
| 3 |
Bad muffler adjustment. |
- Center pins in adjustable mufflers should be equally adjusted to
one turn out from seat for maximum flow or to maximum in without reducing pump flow
requirements.
|
- Muffler adjustment can band-aid fix many non pump related problems
such as faulty liquid valves down stream. If sensitive or constantly changing muffler
adjustment is required, other problems exist. Proceed with other troubleshooting
procedures in this section.
|
| 4 |
Plugged Pump Guard inlet filter. |
- Open Pump Guard filter and visually inspect for obstructions.
|
- Clean out or replace Pump Guard inlet filter.
|
| 5 |
Malfunctioning liquid valve upstream from pump. |
- Replace inlet tubing with testing tube running directly from inlet
on the pump to the tank and see if normal operation resumes.
|
- Replace defective liquid valve.
|
| 6 |
Malfunctioning liquid valve downstream from pump. |
- Replace outlet tubing with testing tube running directly from
outlet on the pump to the tank and see if normal operation resumes.
|
- Replace defective liquid valve.
|
| 7 |
Kink in inlet or outlet liquid lines. |
- Visually inspect lines for kinks.
|
- Replace kinked line(s).
|
| 8 |
Kink in air supply line(s). |
- Visually inspect line for kinks.
|
- Replace kinked line(s).
|
| 9 |
Outlet air from mufflers (or muffler ports) tied together. |
- Visually inspect to make sure that muffler exhausts remain
independent.
|
- The pump does not need mufflers to run, but pressure from the two
ports must remain separate until reaching atmospheric pressure.
|
| 10 |
Non White Knight Shuttle Valve or shifting mechanism. |
- Visually inspect to make sure that the pump is attached to the
White Knight supplied shuttle valve.
|
- Replace any other drive Mechanism with the White Knight shuttle
valve. White Knight AT and AP series pumps are not designed to run with timer type
shuttles. Running a White Knight pump with any shifting mechanism other than a White
Knight shuttle valve nullifies the White Knight warranty.
|
| 11 |
Ruptured Bellows |
- Check to see if mist or dripping is coming from mufflers.
|
- Return pump to White Knight or authorized service center.
|
| 12 |
Tubing connector screwed directly into shuttle valve rather than
into ell adapter. |
- Visually inspect for presence of White Knight ell adapter.
|
- Install ell adapter before tubing connector in shuttle valve. If
this does not remedy the problem, damage may have occurred to the shuttle valve and
shuttle valve replacement may be required.
|
| 13 |
Air under-supply.
|
- Physically check to make sure that all lines back to the source
are at least 3/16 inch I.D. for 5 gallon per minute pumps. ¼ inch I.D. for 10 gallon per
minute pumps. 3/8 inch I.D. for 30 gallon per minute pumps.
- Multiple or oversized lines are required if multiple air consuming
devices are used on the same supply line. Respect all air consumption carts (max. 9.5 SCFM
for 5 gpm pumps, 14 SCFM for 10 gpm pumps, and 25 SCFM for 30 gpm pumps).
- Check for undersized valves, flow meters and/or regulators
supplying the pump. Take into account all devices operating off of the valve(s) and
regulator(s). Also note that many valves and regulators give flow capacities sufficient to
supply the pump at 60 psi only if the valve or regulator is supplied with 100 psi.
(Maximum air pressure past the regulator to the pump is 60 psi!!!)
- Minimum operating pressure is 20 psi.
- Kink in air supply line.
- Undersized orifice in tubing connectors.
- Pump shuttle valve failure.
- Internal pump failure.
|
- Install proper tubing size.
- Install proper air lines for sufficient air consumption at psi
requirements.
- Install properly sized valves, flow meters and/or regulators.
Adjust air supply pressure to the regulator to allow sufficient air flow out of the
regulator.
- Set regulator supplying pump to between 20 and 60 psi.
- Replace air supply line.
- Replace tubing connectors with those of proper orifice size.
- Replace shuttle valve or return pump to White Knight or authorized
service center.
- Return pump to White Knight or authorized service center.
|
