Controls and Operating
3-44
EST-37 Automatic Shift Transmission
The EST-37 transmission is equipped with an electronic control unit
(ECU) which continually monitors the transmission and shift system elec-
trical components and warns the operator when a problem develops. It
also takes action to prevent damage to the transmission, and provides the
serviceman with diagnostic capabilities so that problems can be corrected
quickly and easily.
When a fault occurs, a two digit error code will be displayed on the LCD
display on the dash panel. The error code is also recorded in the trans-
mission ECU, and can be accessible by the serviceman by plugging in a
data reader to extract information relating to the fault. The error code
recorded in the ECU memory will remain until it is erased by a technician.
If a major fault is detected, it is the operator’s responsibility to shut down
the machine as soon as it is safe to do so. The machine should not be
restarted until the fault has been diagnosed and corrected.
Refer to 'Description of Fault Codes Ergocontrol' table for a list of fault
codes and checks in Section 3.
The EST-37 transmission control has been designed to provide the driver
with maximum operational flexibility, by allowing the choice of automatic
or manual gear selection to optimize vehicle performance under all oper-
ating conditions.
The transmission provides six forward gears, three reverse gears and a
neutral position. The gear positions are indicated on the DISPLAY screen.
When the lever is in the automatic range, shifts will occur automatically
between 1st and 6th gear, depending on operating requirements. The
reverse gears 1st through 3rd are manual mode only.
NOTICE: When in manual mode, if the engine speed drops below the lock
up disengaging speed, the transmission will automatically downshift to the
next lowest gear. A manual upshift will only be accepted if the transmis-
sion is in lock up.
NOTICE: To perform a stall test, manual upshifts can be selected without
lock up being engaged by special activation of the auto/manual button on
the gearshift controller. Described in Section 3.
NOTICE: Before any welding
is done on a machine
equipped with an EST- 3 7 s h i f t
system, disconnect the fol-
lowing in this order: battery
earth cable, battery supply
cable, alternator earth cables,
alternator supply cables and
electrical connections at the
engine EMS, transmission
ECU, hydraulic ECU, DIS-
PLAY ECU and cab bulk-
head to avoid damage to
electrical components. Turn
off the battery master switch
to isolate the batteries before
disconnecting any compo-
nents.
After welding connect all of
the above in reverse order.
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