5. Automatic Shut-Offs and Circuit Breakers
■
Automatic Shut-Offs
The ATB 42/50 engine will automatically shut off if:
1. The engine temperature gets too high.
2. The engine oil pressure gets too low.
3. The main circuit breaker trips.
A continuous tone alarm will sound as the engine
begins to overheat or if the oil pressure is low. For
circuit breaker problems there is no audible alarm.
The subsections below explain the shut-offs in
more detail.
See the “Safety Devices” chapter 2, for an alarm
timing diagram.
If you are aloft in the platform when a
continuous tone alarm sounds, IMMEDIATELY
lower the platform to ground by using normal
operating procedures or emergency operating
procedures if the engine will not run. Then,
check the ATB 42/50 as described below.
Failure to do so might result in harm to the ATB
42/50 or might result in stranding you aloft, in
some cases, with no EMERGENCY POWER.
❑
Engine Temperature
If the temperature of either a gasoline or diesel
engine reaches 220°F (104°C) a warning alarm
will sound. If the temperature continues to climb
to 230°F (110°C) the engine will automatically
shut off and cannot be restarted until it cools.
Check engine coolant level (see “Daily Inspection
and Maintenance” chapter 7), before you try to
restart the engine. If the coolant is low, replenish
it then start the engine and visually check the
radiator, radiator hoses, and engine head gasket
for leaks. If the engine will not restart, or if it
automatically shuts off a second time, refer the
problem to a qualified service technician.
❑
Engine Oil Pressure
If the engine oil pressure drops to an unsafe level
the engine automatically shuts off and an alarm
sounds. If you are aloft in the platform and the
engine automatically shuts off and will not restart,
use EMERGENCY POWER to lower the platform
(see “Emergency Operation” chapter 9).
Check the engine oil level (see “Daily Inspection
and Maintenance” chapter 7), before you try to
restart the engine. If the engine oil is low, replenish
it then check for leaks. Check the engine oil filter
(with the engine turned off) to be sure it is in place
and tight. If the engine will not restart, or if it
automatically shuts off a second time, refer the
problem to a qualified service technician.
The oil filter (1) on a Ford engine is easy to reach.
The oil filter (2) on a Kubota engine is on the
back side of the engine, approximately where the
fuel filter (3) is on the front side.
ATB 42/50 – 0161987
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