Testing; Verify Safety Interlock System Operation - Toro Hydroject 3010 Service Manual

Testing

It is often to the technician's advantage to leave the
components intact in the electrical system, and by
studying the electrical troubleshooting charts and sche­
matics, determine which component is at fault. How­
ever, this section will define given components, and the
tests that can be performed on those components, when
those parts are disconnected from the electrical system.
For accurate resistance and/or continuity checks, elec­
trically disconnect the component being tested from the
circuit.

Verify Safety Interlock System Operation

The safety interlock system prevents the engine from
cranking or starting, unless traction bail is in NEUTRAL
and prevents the water system from engaging if ma­
chine is in the transport (raised) position. It also stops
aeration if traction bail is released while operating or if
machine is raised to the transport position.
CAUTION
The interlock switches are for the operator's
protection, so DO NOT disconnect them.
Check operation of switches daily to make
sure interlock system is operating. If a switch
is defective, replace it before operating. Re -
gardless if switches are operating properly or
not, replace interlock switches every two (2)
years to assure maximum safety. Do not rely
entirely on safety switches; use common
sense!
To do a functional check of interlock system:
1. Put machine in a flat, open area on rough turf away
from buried wires, plumbing, etc. Stop the engine.
2. Move traction bail up and down while trying to start
the engine. If engine cranks there is a malfunction in the
interlock system that must be corrected. If engine does
not crank, go to step 3.
Hydroject 3010
When testing electrical components for con-
tinuity with a volt-ohm meter or continuity
tester, make sure that power to the circuit has
been disconnected.
NOTE: Electrical troubleshooting of any 12 Volt power
connection can also be performed through voltage drop
tests without disconnection of the component.
3. Connect water supply to machine. Turn on water
supply and bleed all air out of the system. Water pres­
sure must be 20 to 30 PSI or more. Start the engine.
Raise machine to transport position (up off of rollers).
Push aerate ENGAGE button. If water pump engages
and machine begins aerating, there is a malfunction in
the interlock system that must be corrected. If machine
does not begin aerating, go to step 4.
4. Lower machine to aerate position (on rollers). Engage
traction bail to start machine moving. Push, then release
aerate ENGAGE button. Water pump should engage
immediately, then machine should begin aerating 5 sec­
onds after pump engages. Release traction bail to neu­
tral position so machine stops moving. The water pump
should disengage 4 seconds after traction bail returns
to neutral, then stop aerating after another 3 seconds.
If machine does not stop aerating when traction bail
returns to neutral, there is a malfunction in the interlock
system that must be corrected. If machine stops aerat­
ing, go to step 5.
5. Engage traction bail to start machine moving, then
push aerate ENGAGE button to begin aerating. Push
aerate DISENGAGE button. The water pump should
disengage immediately, then stop aerating after 3 sec­
onds. If machine does not stop aerating, there is a
malfunction in the interlock system that must be cor­
rected.
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CAUTION
Testing