Smart Power Systems
®
A. C. MODULAR GENERATOR SYSTEM
Page 46 of 56
Hydraulic Problems:
1.
Cavitation:
Cavitation is caused by trying to pump more fluid than is available at the pump
inlet due to system restrictions. Pump cavitation sounds like “marbles” passing
through the pump. Conditions frequently associated with cavitation are the following:
a. Too many restrictive fittings such as elbows and reducers on the pump inlet hose.
b. Tight bends or kinks in pump inlet hose and/or tubing.
c. Insufficient tray height above the pump, resulting in low head pressures.
d. Under sized pump inlet hose (minimum pump inlet
hose size is 1”).
e. Excessive long inlet hose (may be corrected by using larger hose).
f. Cold hydraulic fluid.
Finding the cause and correcting it should stop cavitation.
Install a 0-25 psig gauge in line between inlet hose fitting and pump inlet port. Engage
PTO. Operate genset with no load for twenty minutes to purge air out of the system.
Observe the pressure reading. The pressure should always be positive. If the
pressure is not positive, system repair/rework is required.
2.
Aeration:
Aeration results from air being drawn into the system
through leak paths or a low
fluid condition. Aeration makes a “growling” sound and produces visible bubbles in
the fluid stream and/or reservoir. Conditions frequently associated with aeration are
the following:
a. Air leaks in the pump inlet flow path.
b. Low fluid level allowing air to be drawn into the system.
Verify there are no air bubbles in the fluid by viewing inside the reservoir. If there are
air bubbles, check fluid level, tighten all fittings, and look for cracked fittings or hose
leaks on the pump inlet line. Replace any suspect parts and adjust fluid level.
After correcting any problems, again operate the generator twenty minutes to purge
air out of the hydraulic fluid. Note that any bubbles seen in the reservoir indicate
leakage in the pump inlet line.
3.
Differential Pressure:
Differential pressure between the inlet pressure and the case pressure over 7
psig causes the piston shoes to lift off the swash plate.
This occurs due to the
excessive lower pressure created on the fill (down) stroke of the piston. When the
swash plate begins its upstroke, with pump rotation, it comes back into contact with
the piston shoe, creating chatter.
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