Manitowoc 2250 Service And Maintenance Manual

Reference Only
TROUBLESHOOTING 2250 SERVICE/MAINTENANCE MANUAL
10-42
Published 11-06-15, Control # 040-13
Test 8 — 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 (113,5 L/min). Flow meters can be ordered from
Manitowoc Cranes, Inc.
Acceptable leakage is based on combined case flow of the
pump and motor. Combined case flow of the load drum pump
and motor should be equal to a charge pump flow or 8.9 gpm
(33,7 L/min) per 1,000 rpm of the engine.
Combined case flow of the boom hoist, swing, travel or
luffing jib hoist pump and motor should be equal to a charge
pump flow or 4.8 gpm (18,2 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
The external loop flush valve must be removed from boom
hoist motor before testing (see to Test 23 — Servicing the
Motor Loop Flushing (Purge) Valves). 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 (18,9 L/min).
• Record all measurements at neutral.
• At heavier loads, normal case flow may go to 7 gpm
(26,5 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 (16,7 or 20,8 L/min).
• Reconnect the motor case drain hose to motor drain
port.
Pump Test
See Test 9 — Location of Pump Ports
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
P1532
P894
1
2
3
3
Pumps
Motors

Manitowoc 2250 Specifications

General

Brand	Manitowoc
Model	2250
Category	Construction Equipment
Language	English