Manitowoc 16000 - Loop Flushing Valve Adjustment; Manual Override Tests; Motor Leakage Test

Reference Only
HYDRAULIC SYSTEM 16000 SERVICE/MAINTENANCE MANUAL
2-30
Published 05-03-17, Control # 228-03
Motor Leakage Test
Perform the following test if troubleshooting indicates the
need:
• Low Charge Pressure
• Sluggish Operation
• Excessive Heat
See Figure 2-28
for the following procedure:
1. Stop the engine.
2. Install an accurate flow meter in the highest case drain
port (see Figure 2-12
) at the desired motor:
• A 207 bar (3,002 psi) in-line meter with a flow rate of
114 L/m (30 gpm) is required
• All motors except the swing require 16 ORS fittings
Swing requires 12 ORS fittings
3. For hoist motors only, disable the loop flushing:
a. Disconnect the loop flushing hose (2) from the
elbow in the loop flushing valve (1).
b. Install an 08 ORS cap on the end of the elbow and
an 08 ORS plug in the end of the hose.
4. Start the engine and run at high idle.
5. Monitor the flow meter. Under all operating conditions,
leakage should not be more than 5.7 to 9.5 L/m (1-1/2 to
2-1/2 gpm).
6. Stop the engine and enable the loop flushing by
reconnecting the hose to the elbow in the loop flushing
valve.
7. Start the engine and run at high idle.
8. Monitor the flow meter. Under all operating conditions,
the leakage should not be more than 20.8 to 24.6 L/m (1-
1/2 to 2-1/2 gpm).
9. If the motor leakage without loop flushing is not within
the specified range, replace the motor and pump.
10. If the motor leakage with the loop flushing is not within
the specified range, replace the loop flushing valve and/
or the motor and pump depending on which is the cause
for the high leakage.
Loop Flushing Valve Adjustment
The loop flushing valves for the hoists – load and boom – are
not adjustable. Do not tamper with the settings of the valve
cartridges in the loop flushing valve manifold.
If you are experiencing excessive leakage do to a faulty loop
flushing valve, replace the valve.
Manual Override Tests
The pumps, motors, and solenoid valves are equipped with
manual overrides that allow electrical problems to be
isolated from mechanical problems when troubleshooting
hydraulic system problems.
DANGER
Falling or Moving Load Hazard!
To prevent unexpected movement of loads or the crane
when operating any manual override:
• Park the crane in an area where it will not interfere
with other job site equipment or structures.
• Land all loads and lower the boom onto blocking at
ground level.
• Park all crane functions.
FIGURE 2-28
Typical Motor Installation
Item Description
1 Loop Flushing Valve
2 Loop Flushing Hose
3 Motor
1
2
1
P2297b