Textron Jacobsen Super LF 1880 Fairway Mower with ROPS, Инструкции по обслуживанию и ремонту

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ELECTRICAL SYSTEM
10G-15
SECTION 10G. SWITCHES
GENERAL
This section provides instructions for testing the vari-
ous switches in the electrical system. Repair is limited
to replacement of components found faulty during test-
ing. See Section 10Q for location of components.
Switches can be defined as NO (normally open) or NC
(normally closed). A normally open switch blocks the
flow of current until the switch is activated. A normally
closed switch allows current to flow until the switch is
activated. Testing a switch allows the mechanic to
determine if the switch actually opens or closes when
activated and if it is activated.
SEAT SWITCH TEST
The seat switch allows the engine to run when the
operator is in the seat and the reels are operating. If
the operator leaves or falls from the seat with the
engine running, the engine will shut down. See
Figure 10G-1 and test switch as follows:
1. Unplug the switch from the harness.
2. Set the multimeter to the continuity scale.
3. Connect one lead to each side of the harness con-
nector. See Figure 10G-1.
The seat switch should be open with no continuity
shown or heard on the multimeter.
4. Depress the seat switch or have a helper sit in the
seat.
The seat switch should be closed and a reading of
0 to 0.5 Ohms on the multimeter.
NOTE:
Replace the switch if the test results are not satis-
factory.
Figure 10G-1. Seat Test
IGNITION SWITCH TEST
1. Disconnect ground (black) cable at battery.
2. Remove the control panel from the top of the
hydraulic tank.
3. Remove the wiring harness connector from the
ignition switch.
4. Set multimeter to continuity scale.
NOTE:
If a reading of 0.5 Ohms exists in any of the fol-
lowing tests the ignition switch is faulty and must
be replaced.
5. See Figure 10G-2 and all switch positions as fol-
lows:
a. With the ignition switch in the OFF position
check all pin positions for continuity.
Continuity should not be available between
any of the pin positions.
b. Place the ignition switch in the RUN position
and connect one test lead to terminal B and
one lead to terminal I.
Continuity should be available between termi-
nals B and I.
c. With the ignition switch in the RUN position,
connect one test lead to terminal B and one
lead to terminal S and then to terminal GP.
Continuity should not be available at terminals
S or GP.
d. Hold ignition switch in the GLOW PLUG posi-
tion. Connect one test lead to terminal B and
one lead to terminal GP.
Continuity should be available between termi-
nals B and GP.
e. Hold ignition switch in the START position.
Connect one test lead to terminal B and one
lead to terminal I.
Continuity should be available between termi-
nals B and I.
10G