Greensmaster Flex 1800/1820/2100/2120 Page 3 − 11 Engine
Engine Coupler Sleeve
The coupler sleeve used on Greensmaster Flex ma-
chines allows a positive coupling between the engine
and transmission while also providing vibration damping
and quiet operation. The outer surface of the coupler
sleeve includes a series of curved lines that can be used
to gauge the condition of the internal coupler cogs that
are used to connect the engine and transmission cou-
plers.
When the coupler sleeve is new, the center line on the
outer surface of the sleeve is basically straight while the
lines above and below are curved in different directions
(Fig. 9). As the coupler wears with normal machine use,
the curved lines may visually straighten indicated that
the coupler has distorted. When removed from the ma-
chine, the inner cogs of a used coupler may exhibit some
offset as shown in Figure 10. This type of offset will gen-
erally not impact normal machine operation. The cog
offset can be 0.250” (6.4 mm) before coupler replace-
ment is necessary.
If a coupler sleeve has torn or missing cogs, the coupler
should be replaced.
Figure 8
1. Engine
2. Key
3. Engine coupler
4. Set screw (2 used)
5. Coupler sleeve
2
1
3
4
5
65 in−lb
(7.3 N−m)
Figure 9
Figure 10
Engine
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