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Reference
Only
Manitowoc
Published 05-16-17, Control # 233-03
10-53
999 SERVICE/MAINTENANCE MANUAL
TROUBLESHOOTING
10
Test 21 – Testing for Pump and Motor Leakage
Testing for pump and motor leakage requires a 0 – 3,000 psi
(207 bar) in-line flow meter with a minimum flow rate capacity
of 30 gpm (113 L/min). Flow meters can be ordered from the
Manitowoc Crane Care Lattice Team.
Acceptable leakage is based on the combined case flow of
the pump and motor. The combined case flow of the load
drum pump and motor should be approximately equal to a
charge pump flow or 8.9 gpm (34 L/min) per 1,000 rpm of the
engine.
The combined case flow of the boom hoist, swing, travel or
luffing jib hoist pump and motor should be approximately
equal to a charge pump flow or 4.8 gpm (18 L/min) per
1,000 rpm of the engine. The difference between the system
charge pump flow and motor case flow at neutral is the
acceptable pump case flow at neutral for the system under
test.
Motor Test
See Test 14 for location of motor ports. The external loop
flush valve must be removed from boom hoist motor before
testing (see Test 23). To test a motor:
•
Connect flow meter between the motor case drain hose
and the highest motor case drain port.
•
With the engine running at 1,000 rpm, measure the flow
rate of the motor.
•
Case flow at neutral or very light loads should be
approximately 5 gpm (19 L/min).
•
Record all measurements at neutral.
•
At heavier loads, normal case flow may go to 7 gpm
(26 L/min).
•
Motors that do not have loop flushing, case flow at
neutral should not exceed 1.5 gpm (5,7 L/min).
•
Motors that do not have loop flushing, case flow at
heavier loads and higher rpm may increase to 4.5 or 5.5
gpm (17 or 21 L/min).
•
Reconnect the motor case drain hose to motor drain
port.
Pump Test
See Test 13 for location of pump ports. To test a pump:
•
Connect the flow meter between the pump case drain
hose and pump port L1 or L2.
•
Use the highest port for testing.
•
With the engine running at 1,000 rpm, measure the flow
rate of the pump at neutral and compare to the
calculated acceptable pump case flow.
Deviations from the normal or major changes with increasing
system pressure more than +/-1 gpm (3,8 L/min) are an
indication of a pump or motor problem.
Item
Description
1
Case Drain Hose
2
In-line Flow Meter
3
Hose to Highest Case Drain Port
P1601
P1602
2
3
1
3
Pumps
Motors
2
1
Содержание 999
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