Rev. B
Reelmaster 5010 Series Page 5 -- 31 Electrical System
Up Limit Switch
The up limit switch is a normally open proximity switch
that closes when the cutting units are in the lowered
position. A bracket on the front, right lift arm acts as the
sensing plate for the up limit switch (Fig. 37). The switch
on machines with a serial number below 310000000 is
different than the switch on machines with serial num-
bers above 310000000 but the switch function is the
same.
Testing
1. Before testing the up limit switch, the switch and its
circuit wiring should be tested as an ECM input with the
Diagnostic Display (see Diagnostic Display in the Trou-
bleshooting section of this chapter). If the Diagnostic
Display verifies that the up limit switch and circuit wiring
arefunctioning correctly, no further switch testing is nec-
essary. If the Diagnostic Display determines that the up
limit switch and circuit wiring arenotfunctioning correct-
ly, proceed with testing procedure.
2. On machines with serial numbers below 310000000
(Fig. 37), test up limit switch as follows:
A. Make sure ignition switch is in the OFF position.
Disconnect the wire harness electrical connector
from the switch. Check the continuity of the switch by
connecting a multimeter ( ohms setting) across the
switch connector terminals.
B. There shouldbe continuity (closed) between the
switch terminals when the cutting units are lowered.
Raise the cutting units and check the continuity of the
switch. There should not be continuity (open) be-
tween the switch terminals when the cutting units are
raised.
3. On machines with serial numbers above 310000000
(Fig. 38), test up limit switch as follows:
A. Turn ignition switch to the ON position (do not
start engine) and check LED on cable end of up limit
switch.
B. LED shouldbeilluminated when the cutting units
are lowered. LED should not be illuminated when
the cutting units are raised.
NOTE: When installing the up limit switch on machines
with serial numbers below 310000000, place switch
plate tab into switch mounting hole that is closest to tar-
get end of switch.
4. If up limit switch is faulty, replace switch. Adjust
switch after installation (see Up Limit Switch in the Ad-
justments section of this chapter).
5. If the up limit switch tests correctly and a circuit prob-
lem still exists, check wire harness (see Wiring Sche-
matic and Circuit Drawings in Chapter 9 -- Electrical
Diagrams).
6. Make sure that wire harness electrical connector is
connected to the up limit switch after testing.
1. Lift arm
2. Up limit switch
3. Sensing plate
4. Lock nut (2 used)
5. Switch bracket
Figure 37
1
2
3
4
5
1. Up limit switch
2. Lock washer
3. Jam nut
4. Lift arm
Figure 38
SERIAL NUMBER
ABOVE 310000000
2
3
1
LED location
2
3
4
FRONT
Electrical
System
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