HALE AP, Technical Manual

Page: 57 / 177

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5.1.3 Insufficient Pump Capacity
Table 13. Insufficient Pump Capacity SCR Table
SYMPTOM CAUSE REMEDY
Insufficient Pump Capacity Insufficient Engine Power Engine power check or tune up may be re-
quired for peak engine and pump perfor-
mance.
Refer to rotation symptoms later in this sec-
tion.
Suction Hose Diameter Is
Too Small For The Volume
Being Discharged
Use a larger suction hose.
Shorten total length by removal of one length.
Reduce volume of discharge.
Restriction In The Suction
Line At The Strainer
Remove any debris restricting entrance of
water at the strainer.
Partial Collapse Of The Lin-
ing In The Suction Hose
Damage to the outer lining may allow air in
between the outer and inner linings causing a
partial collapse. Replace the hose and retest.
Relief Valve Improperly Set If the relief valve control is set too low the
relief valve will open and bypass water. Reset
the relief valve control per the procedures in
Section III. Other bypass lines (such as foam
system or in line valves) may reduce pump
capacity or pressure.
5.1.4 Engine Speed Problems
Table 14. Engine Speed SCR Table
SYMPTOM CAUSE REMEDY
Engine Speeds Too High
For Required Capacity Or
Pressure
Truck Transmission In
Wrong Range Or Gear
Verify the transmission is in the correct range
and/or gear. Change range or gear if re-
quired.
Lift Too High, Suction Hose
Too Small
Higher than normal lift (10 ft) will cause
higher engine speeds, high vacuum and
rough operation. Use larger suction hose.
Bring the pump closer to the water source.
Defective Suction Hose Inner line of suction hose may collapse when
drafting and is usually undetectable. Change
the suction hose on the pump; test for com-
parison against original hose.
Blockage Of Suction Hose
Strainer
Clean suction hose strainer of obstruction
and follow recommended practices for laying
suction hose.
Pump Is Approaching Cavi-
tation
Gate the discharge valves to allow pressure
to increase. This will reduce flow.
Reduce the throttle opening to the original
pressure setting.