Insufficient pump capacity – Hale 80FC User Manual
Page 73
73
Pump Ends
p/n: 029-0020-61-0
T r ou b les h oo tin g
❑
Pump Loses Prime
or Will Not Prime -
continued.
Air leaks.
• Attempt to located and correct air leaks using the following proce-
dures:
• Perform “Dry Vacuum Test” on pump per NFPA standards with
22” Hg. minimum vacuum required with loss not to exceed 10”
Hg. in five (5) minutes.
• If a minimum of 22” Hg. cannot be achieved, the priming device
or system may be inoperative, or the leak is too big for the
primer to overcome (such as an open valve). The loss of vac-
uum indicates leakage and could prevent priming or cause loss
of prime.
• After priming shut OFF the engine. Audible detection of a leak
is often possible.
• Connect the suction hose from the hydrant or the discharge of
another pumper to pressurize the pump with water and look for vis-
ible leakage and correct. A pressure of 100 PSI (6.9 BAR / 0.7
MPa) should be sufficient. DO NOT exceed pressure limitations of
pump, accessories or piping connections.
• The suction side relief valve can leak. Plug the valve outlet con-
nection and retest
Insufficient Pump
Capacity.
Chart continued on
next page.
Insufficient engine
power.
• Engine power check and tune up may be required for peak engine
and pump performance.
• Also see Section “Rotation Symptoms.” on page 77.
• Recheck pumping procedure for recommended transmission gear
or range. Use mechanical speed counter on pump panel to check
actual speed against possible clutch or transmission slippage or
inaccurate tachometer.
• Check truck manual for proper speed counter ratio.
Relief valve improperly
set - if so equipped.
• If relief valve pressure is set too low it allows the valve to open and
bypass water.
• Reset the relief valve pressure accordingly.
• Also see Section 4 Preventive Maintenance, heading “Relief Valve
Suction hose diameter
is too small for the vol-
ume being discharged.
• Use larger suction hose.
• Shorten total length by removing one length at a time.
• Reduce volume of discharge.
Restriction in suction
line at strainer.
• Remove any debris restricting entrance of water at the strainer.
• Also see Section 4 Preventive Maintenance, heading “Intake
Air leaks.
• See heading “Air leaks.” under condition “ Pump Loses Prime or
Will Not Prime” on page 73.
Condition
Possible
Cause
Suggested Corrective Action
Figure 5-2: Troubleshooting Chart