5. Automatic Shut-offs and Circuit Breakers
■
Automatic Shut-offs
❑
Level sensor
When the level sen sor alarm sounds, au to matic in -
ter locks make it im pos si ble to drive the
RT
or raise
the plat form. For more com plete in for ma tion see
the Level Sen sor sub sec tion of the Safety De vices
2 chapter.
❑
Engine temperature
Figure 5.1 - Engine Temperature Sensor
There is a tem per a ture sen sor in the en gine. It
mea sures the tem per a ture of the an ti freeze-wa ter
mix ture as the mix ture leaves the top of the ra di a tor
and en ters the top of the en gine. If the tem per a ture
reaches 210(F (99(C) an alarm sounds. If the tem -
per
a
ture con
tin
ues to rise, the en gine shuts off
when the tem per a ture reaches 230(F (110(C). The
en gine will not re start un til the tem per a ture drops
below 210(F (99(C).
❑
Engine oil pressure
Figure 5.2 - Engine Oil Pressure Sensor
There is an oil pressure sensor in the engine. It
measures the engine oil pressure at the oil filter. If
the pressure falls below a safe operating value the
engine shuts off. The engine will restart with low
pressure but it will only run a few seconds before it
automatically shuts off again.
❑
Platform height vs. drive speed
When the plat form is over 1.7m (5 6") above the
ground the drive speed is lim
ited to its slow
est
speed and the en gine revs are also au to mat i cally
low ered.
❑
Dynamic brakes
When you drive an
RT
down a slope, if the
RT
be -
gins to coast (out run the drive mo tors) the hy drau lic
sys tem senses the coast ing con di tion. The hy drau -
lic drive mo tors then be come hy drau lic brakes and
the
RT
is slowed. This ac tion pre vents SRs from
speed ing down grades.
❑
Alternator not charging
Figure 5.3 - Alternator Output Shutdown
When the fan belt breaks, or the al ter na tor out put
falls be low a safe level for other rea sons, the en -
gine au to mat i cally shuts off and an alarm sounds.
As long as the
RT
bat tery is charged you can lower
the plat form, in the usual way, from the plat form
con trol box or the ground con trol box with out the
en gine running.
❑
Stabilisers
The
RT
can not be driven un less the sta bi lis ers are
com pletely up. If you have just raised the sta bi lis -
ers but the
RT
will not drive, dou ble check to be
sure all four sta bi lis ers are com pletely up.
SR3370 & SR2770 – 13184A
Rev A
page 5 - 1
