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Specifications Information and Repair Parts Manual
Problem
Pump fails to prime
Priming remedies that will NOT work:
Follow above priming troubleshooting guide.
If pump still will not prime after all corrective action is exhausted, check pump priming capacity by:
Reduced capacity or discharge
pressure
Pump will not work/engine will not
turn over
Pump will not work/engine runs
800-350-8739
Possible Cause(s)
1
Pump not filled with liquid
2
Air leak at suction line connection
3
Worn suction connection gasket
4
Leaking suction line
5
Engine speed too low
6
Worn or broken volute or impeller
7
Leaking/worn mechanical shaft seal
8
Clogged suction strainer/line
9
Suction lift too great (25 ft. max)
10 Suction line too long
11
Pump is air locked
1.
Holding suction line out of liquid source and forcing liquid into end while pump is running
2.
Pinching off the discharge line to "build up pressure".
3.
Holding hand against end of suction line or pump suction port to "feel" for suction.
1.
Install a vacuum gauge on capped suction port. Gauge to suction port connection must be
100% air tight.
2.
Fill pump casing completely with water.
3.
Run pump at full speed, some water will be thrown out of discharge.
4.
Vacuum gauge should register 18-22 inches of mercury within a minute or so.
a. If vacuum registers below 18 in of hg check gauge to pump connection for air leaks,
inspect/replace volute, impeller and shaft seal as required.
b. If vacuum gauge value is within range pump is working correctly. The problem is not
the pump.
1.
Clogged strainer or lines
2.
High friction loss in line
3.
Discharge head too high
4.
Engine speed too low
5.
Drop in engine output
6.
Clogged impeller
7.
Worn/damaged impeller or volute
1.
Clogged pump
2.
Pump parts rusted together
3.
Damaged impeller or volute
4.
Engine seized
1.
Impeller stripped/key sheared
2.
Pump impeller/volute clogged
3.
Will not prime
4.
Insufficient liquid supply
Corrective Action
1
Add liquid to pump through priming port
2
Add sealant to connection
3
Replace suction gasket
4
Inspect, repair or replace suction line
5
Run engine at maximum speed
6
Replace parts as required
7
Replace mechanical shaft seal
8
Clean strainer and suction line
9
Reduce lift
10 Reduce length to under 30 feet
11
Vent pump discharge through priming port
1.
Clean strainer, suction and discharge lines
2.
Remove kinks and elbows, reduce length
3.
Lower end of discharge line, remove
nozzles
4.
Increase engine speed
5.
Repair engine
6.
Remove clog
7.
Replace parts as required
1.
Remove clog between impeller and volute
2.
Disassemble pump, free parts
3.
Replace volute or impeller
4.
Remove pump from engine, check engine
itself
1.
Disassemble pump, replace parts/engine
2.
Clean pump
3.
See Priming Troubleshooting Section
4.
Increase liquid supply
5
BRP500TP2, BRP520TP3, BRP650HP2
MBRP500TP2 Rev A | 3/2020
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