Automatic Shut-Offs And Circuit Breakers; Automatic Shut-Offs; Level Sensor; Engine Temperature - Snorkel S3970BE Operation Manual

n Automatic Shut-offs
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Level sensor

When the level sen sor alarm sounds, au to matic in -
ter locks make it im pos si ble to drive the S3970RT /
S3370RT / S2770RT 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.
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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).
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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
S3970RT, S3370RT & S2770RT – 13865-1

5. Automatic Shut-offs and Circuit Breakers

engine shuts off. The engine will restart with low
pressure but it will only run a few seconds before it
automatically shuts off again.
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Platform height vs. drive speed

The ma chines fea ture a vari able max i mum drive
speed with height. As the el e va tion gets higher the
drive speed re duces.
This speed change is au to matic and re quires no
user in ter ven tion. Re fer to the Op er a tion chap ter
for fur ther in for ma tion.
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Dynamic brakes

When you drive the ma chine down a slope, if the
S3970RT / S3370RT / S2770RT 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
S3970RT / S3370RT / S2770RT is slowed. This ac -
tion pre vents the S3970RT / S3370RT / S2770RTs
from speed ing down grades.
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Alternator not charging

Figure 5.3 - Alternator Output Shutdown
If 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 S3970RT / S3370RT / S2770RT 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.
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Load sensing system

When the alarm sounds au to matic in ter locks pre -
vent all plat form move ment [drive for ward / re verse
and lift up / down. For more com plete in for ma tion
see the Load Sens ing sub sec tion of the Safety De -
vices 2 chap ter.
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