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1
1. Unscrew the nut (1) and remove the breather.
2. Replace the breather and tighten to 12 to 16 N⋅m
(9 to 12 lb ft).
Transmission Stall Test and Neutral
Cool-down Check
The transmission stall test is used when trouble-
shooting, it can determine if a problem is with the
transmission or the engine.
The neutral cool-down check uses a two minute
cooling period after the stall test to gather fluid tem-
perature data for troubleshooting.
BELL EQUIPMENT Product support should be noti-
fied when the operator feels that the following tests
need to be performed.
Transmission Stall Test
The transmission stall test can be performed when a
machine is performing unsatisfactorily.
The following procedure must be used to perform the
stall test:
‹ WARNING
Park the machine clear of any obstacles, apply
the park and service brakes and chock the
wheels. Keep personnel clear of the machine.
1. Ensure that the transmission is at normal oper-
ating temperature; 71°C to 93°C (160°F to
200°F).
2. Select D (Drive)
100
1. Never maintain the stall condition for more
than 30 seconds at any one time because of the
rapid rise in fluid temperature. Do not allow the
converter-out fluid temperature (transmission
fluid temperature as displayed on the driver's in-
strument panel) to exceed 120°C (248°F)
2. Never permit a stall condition to arise if the
converter-out fluid temperature (as displayed on
the driver's instrument panel) is below 45°C
F001369
(113°F) or if the sump fluid temperature (as dis-
played on the Pro-Link® 9000 diagnostic tool) is
below 30°C (86°F).
3. Serious transmission damage will be caused if
the CAUTIONS above are ignored.
3. Increase and hold the engine speed to maxi-
mum.
4. Record the stabilised engine speed and the
transmission fluid temperature.
5. Reduce engine speed to low idle and select neu-
tral (N).
6. With the transmission in neutral, run the engine
at 1 200 to 1 500 rev/min for two minutes to allow
the transmission fluid to cool down.
7. Record the transmission fluid temperature and
check the data recorded against the results be-
low.
Stall Test Results
• If the engine stall speed is more than 150
rev/min below 1 536 rev/min, an engine prob-
lem is indicated.
• If the engine stall speed is more than 150
rev/min above 1 536 rev/min, a transmission
problem is indicated.
• If the engine stall speed is less than 150 rev/min
and the engine does not smoke, it could indicate
that the problem is a freewheeling stator in the
converter.
• If the stall speed is 1 536 rev/min but the trans-
mission fluid temperature is above 120°C
(248°F) compare this temperature to the tem-
perature after the two minute cooling-down
period. If the temperature did not lower, a stuck
stator could be the cause.
‹ CAUTIONS
870984-01
June 1, 1999
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