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GROVE
Published 1-20-2017, Control# 483-02
7-21
CD5515-2/YB5515-2 SERVICE MANUAL
TRANSMISSION AND TORQUE CONVERTER
7
When testing other suspect clutches, connect a gauge to the
relevant suspect clutch pressure test point. See Figure 7-15
for position of individual clutch pressure test points. Because
the forward high clutch is suspect, a gear must be selected
that will use the forward high clutch, in this instance 2nd gear
forward.
1.
Stop the engine and connect a 0-20 bar (0-300 psi)
pressure gauge to test connector
A
, Figure 7-15
(mainline pressure test point).
2.
Connect a 0-20 bar (0-300 psi) pressure gauge to test
connector
L
(forward high ratio clutch test point).
3.
Remove the layshaft clutch solenoid feed connector
H
,
Figure 7-16. This ensures only the forward high clutch is
energized when 2nd gear forward is selected.
NOTE:
See Figure 7-15 for identification and position of
solenoid feed connectors when testing other
suspect clutches.
4.
Make sure that both sides of all four wheels are
chocked. Apply foot brake and parking brake.
5.
Start the engine and run at 1000 rpm, select 2nd gear
forward. Note the pressure readings on both gauges,
which should not vary more than 0.7 bar (10 psi). If the
difference on the gauges is greater than 0.7 bar (10 psi)
do the following:
a.
Stop the engine and interchange the gauges.
b.
Start the engine and run at 1000 rpm. Select 2nd
gear forward. If the difference on the gauges is still
greater than 0.7 bar (10 psi), service the forward
high clutch.
c.
If after interchanging the gauges, the readings are
different than in step 4, have the gauges calibrated
and repeat the test procedure.
Converter Stall Test
NOTE:
Engine speed must be recorded during this test.
This machine is not equipped with a tachometer.
One must be installed to perform this test.
B e f o r e c o m p l e t i n g t h e f o l l o w i n g t e s t , r e m o v e t h e
transmission dipstick. If there is any sign of smoke emitting
from the dipstick tube,
STOP THE TEST IMMEDIATELY
and
service the transmission.
1.
Ensure that the engine and transmission are at normal
working temperatures. Run the engine at maximum
speed and check the
No Load Speed (High Idle
Specs)
. See Engine Technical Data in the engine
operator’s manual.
2.
Apply the parking brake and the foot brake firmly. If
necessary, set the machine against a fixed obstruction.
3.
Select 2nd gear forward and run engine at maximum
rpm. Record the engine speed from the tachometer.
Repeat the test for 3rd gear forward and record the
speed reading.
4.
Repeat step 3, except this time select 2nd gear reverse
and 3rd gear reverse respectively. Record the speed
readings.
NOTE:
Using 2nd and 3rd gears in forward and reverse will
ensure that all clutches are energized during the
test.
5.
All recorded readings should be as specified in Torque
Converter Stall in technical data.
If the engine speed is below the stated figures, either the
engine is loosing power and should be serviced/overhauled
or the torque converter reaction member clutch is slipping.
To check the engine, select Neutral, open the throttle fully,
and raise the booms fully to bring the main relief over relief.
The engine speed should fall slightly above the Maximum
Governed Speed. If engine speed is correct, the torque
converter reaction member is slipping.
If engine speed is higher than the Maximum Governed
Speed, check the transmission for clutch slippage or internal
leakage. To isolate a suspected clutch, tabulate the recorded
readings as shown in the example below.
FIGURE 7-16
a0246
CAUTION
DO NOT
stall the converter longer than 10 seconds or the
transmission fluid will overheat. Make sure that the oil
level is correct and at normal operating temperature.
Reference Only
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