Speed Sensor Service Kit Gm70486 - Kohler Decision-Maker 1 Manual

8.20.3 Speed Sensor Service Kit
GM70486
Adapted from TT-1529 3/12.
Speed sensors GM30120, 241623, and 241927 are no
longer available as service parts, see Figure 8-48 and
Figure 8-49. The GM70486 service kit with instructions
provides the means to install a replacement speed
sensor for the discontinued speed sensor. The service
kit works for both permanent magnet generators (PMG)
(FRt II) and wound field (FRt III) models.
1
2
3
1. Speed sensor
2. Locking nuts
3. Bracket
Figure 8-48 Speed Sensor GM30120
1
1. Speed sensor (mounting screws not shown)
2. Pushon terminals
Figure 8-49 Speed Sensor 241623 (241927 Kit)
Special Tools and Service Manuals
The following items are necessary for installing the kit.
The service manuals are recommended.
D
Wire cutter/stripper/crimper
D
Feeler gauge with 0.36--0.71 mm (0.014--0.028 in.)
sizes
D
TP-6353 Fast-Responset II Service Manual (PMG)
D
TP-6349 Fast-Responset III Service Manual
(Wound Field Alternators)
Replacement Procedure
1. Remove the generator set from service.
a. Place the generator set master switch to the
OFF/RESET position (Decision-Makerr 1, 3+,
340, and 550).
OR
Press the generator set master control
OFF/RESET button (Decision-Makerr 3000 or
6000).
TP-6356 4/12
5
GM39354-D
4
4. Mounting screws
5. Pushon terminals
2
241623-B
b. Disconnect the battery charger, if equipped.
c. Disconnect the battery, negative lead first.
2. Removing the old speed sensor.
a. Open the doors on the enclosure, if equipped.
b. Remove the junction box rear access panel and
screws.
c. Remove the LED circuit board cover (FRt II) or
rotating rectifier assembly cover (FRt III).
Refer to the respective service manual for
additional information.
d. Disconnect the speed sensor wiring at the three
pushon terminals.
Figure 8-49.
e. Remove the two screws to remove the speed
sensor. The speed sensor, shims (if used), and
three-hole bracket will not be reused. Save the
screws as they may be reused.
f. If the unit has the Fast Responset II design
alternator, remove the four-hole flat bracket.
The four-hole flat bracket will not be reused.
Save the screws and mounting clamp
(Figure 8-51, Item 1) that is securing the speed
sensor wiring as these parts will be reused.
3. Installing the new speed sensor.
a. If the unit has the Fast Responset II design
alternator, mount the new bracket (Figure 8-50,
Item 4) from the speed sensor kit and replace
the existing mounting clamp (Figure 8-51, Item
1) securing the speed sensor wiring harness to
the generator set end bracket using the original
screws.
Note: The bracket from the speed sensor kit is
NOT used with the wound field design
alternator.
3
2
1
1. Speed sensor
2. Hole for #10--24 x 0.625 in. hex head mounting screws
3. Hole for adjustment screws
4. Bracket (use with Fast Responset II design alternator)
5. Grommet
6. Connector
Figure 8-50 Speed Sensor GM51395
Section 8 Component Testing and Adjustment
See Figure 8-48 or
5
6
4
GM51395-A
149