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TRANSMISSION AND TORQUE CONVERTER
CD5515-2/YB5515-2 SERVICE MANUAL
7-22
Published 1-20-2017, Control# 483-02
In the example shown, the engine speed is abnormally high
when 2nd gear forward is selected, indicating a slipping
clutch.
From the example, it is evident that the layshaft clutch is
working normally (2nd gear reverse indicates 1985 rpm).
Therefore, it follows that the suspect clutch is the forward
high. Assuming all other poss ible faults have been
eliminated (see Troubleshooting), this clutch should be
serviced.
Pressure and Flow Tests
Before completing any transmission pressure/flow tests,
make sure that the oil level is correct and is at normal
operating temperature.
Pump Flow
NOTE:
Special adapters are required to perform the
following test. Contact Manitowoc Crane Care.
Stop the engine. Remove the filter adapter from the
transmission. Install a special test adapter
X
or
X1
(depending on the filter head adapter) onto the threaded
spigot Figure 7-15. Install special test adapter
Y
and secure
with adapter
Z
. Connect flowmeter
W
.
Start the engine and run at 1000 rpm. With the transmission
in neutral, the flowmeter will show the pump flow. Compare
this reading with the pump flow specification on page 7-2. A
low reading indicates a worn pump or blocked suction
strainer.
Repeat the test and note the gauge reading with the engine
running at 2000 rpm.
Stop the engine and remove all test adapters. Install the filter
or the adapter.
Mainline Pressure
Stop the engine and connect a 0-20 bar (0-300 psi) pressure
gauge to the test connector
A
Figure 7-15.
Start the engine and run at 1000 rpm. With the transmission
in neutral the pressure gauge will show the mainline
pressure. Compare this pressure reading with the one listed
on page 7-2. Either a faulty pressure maintenance valve or a
worn pump can cause a low reading. A high reading may
indicate a faulty pressure maintenance valve.
Repeat the test and note gauge reading with engine running
at 2000 rpm.
Stop the engine and remove the test gauge.
Converter Out Pressure/Oil Cooler Flow Rate
Stop the engine and connect a 0-20 bar (0-300 psi) pressure
gauge and flowmeter into the converter out line as shown at
C
and
K
respectively Figure 7-15.
Run the engine at 1000 rpm with the transmission in neutral.
The pressure gauge indicates the converter out pressure
and the flowmeter indicates the oil cooler flow rate. Compare
both readings with the specifications on page 7-2. A blocked
oil cooler could cause a high pressure together with a low
flow.
Repeat step 2 and note the gauge reading with engine
running at 2000 rpm.
Stop the engine, remove the test gauge and flowmeter and
install hoses to original position.
Converter In Pressure
1.
Stop the engine and connect a 0-20 bar (0-300 psi)
pressure gauge to test point
B
Figure 7-15.
2.
Start the engine and run at 1000 rpm. With the
transmission in neutral the pressure gauge will show
“Converter In Pressure”. Compare the gauge reading
with the figures listed in the General Technical Data on
Gear
Selected
Direction
Clutch
Mainshaft
or Layshaft
Clutch
RPM
Second
Forward
High
Layshaft
2060
Third
Forward
Low
Mainshaft
1990
Second
Reverse
High
Layshaft
1985
Third
Reverse
Low
Mainshaft
1980
WARNING
Fine jets of hydraulic oil at high pressure can penetrate
the skin. Do not use your hand to check for hydraulic
leaks. Do not put your face close to suspected leaks. Hold
a piece of cardboard close to suspected leaks and inspect
the cardboard for signs of hydraulic oil. If hydraulic oil
penetrates your skin, get medical help immediately.
If the machine to be raised has a 4WD transmission
installed, make sure all four wheels are off the ground. If
only the front or rear tires are raised, the crane could still
drive through the wheels on the ground.
Take care when disconnecting hydraulic hoses and
fittings. The oil will be hot and could cause burns.
DO NOT
go under the crane with the engine running. Turn
the engine off, apply the parking brake and remove the
ignition key before going underneath the crane.
Reference Only
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