Simplicity AGCO Allis 500 Series, Руководство по обслуживанию и ремонту

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7 Electrical System Service
Seat Switch / Solenoid Tests
7 - 28
I. Seat Switch Test
The seat switch is a normally closed switch, meaning
that when no one is in the seat, the switch is closed and
will conduct current. Sitting in the seat opens the switch.
SEAT SWITCH TEST
1. Tilt the seat forward and pull the wire harness off the
back of the switch.
2. Set VOM to Ohms. With the switch at rest (no opera-
tor pushing down on the seat) probe the switch termi-
nals. The VOM should show continuity.
3. Press down in the middle of the seat to activate the
switch.
4. Probe the switch terminals. The VOM should show
no continuity.
Replace a switch that does not pass all tests.
Figure 27. Test Seat Switch
J. Solenoid Tests
IN-TRACTOR TEST
For this, and all tests, the ground speed control lever
must be in neutral, the parking brake set, and the PTO
switch must be OFF. Unplug and secure the spark plug
wire.
1. Disconnect the yellow wire plug and black wire plug
from the small posts of the solenoid.
2. Connect a jumper lead from one small post to
ground.
3. Connect a jumper lead to the other small post and
then touch it to the positive battery post. The lead
may arch to the battery post–this is normal.
There should be a single audible “click” heard as the
solenoid engages and the engine should turn over. If no
click is heard, proceed to SOLENOID BENCH TEST. If
the solenoid clicks but the starter does not turn the
engine over, check the starter cable and the starter itself.
If the solenoid “clicks” rapidly or repeatedly, recheck the
battery and check all connections for corrosion.
WARNING
The procedure you are about to perform in step 3
will cause the engine to turn over.
Be sure the parking brake is set, the ground
speed control lever is in neutral, the PTO is OFF,
the spark plug wire is disconnected, and the
engine is clear to spin.
Figure 28. Jump Solenoid
To Ground
Touch to Positive
Battery Post
Battery