Kohler K91 Service Manual page 116

High Point From
Fillet Intersections
The Fillet M ust
Blend Smoothly
With The Bearing
Journal Su rface
Fig u re 1 1 -1 6.
When replacing a crankshaft with external threads
on the flywheel end with one that has internal
SHAFT END - GEAR HUB D I ME N S I O N
K91 - - . 7 40- . 750"
K 1 4 1 - - 1 . 1 05 - 1 . 1 1 5 "
K 1 6 1 - - 1 . 1 05 - 1 . 1 1 5 "
K 1 8 1 -- 1 . 1 0 5 - 1 . 1 1 5 "
K241 -- 1 . 0 7 4 - 1 . 084"
K30 1 - - 1 . 0 7 4 - 1 . 084 "
OPTIONAL G EAR REDUCTION UNIT
The reduction unit consists of a driven gear which
is pressed on the power take off (PTO) shaft . The
drive gear is an integral part of the engine crank­
shaft . The g ear reduction on the K 9 1 and K 1 S 1
units is 6 : 1 . The gear reduction o n the K301 en­
g ine is 4: 1 . The PTO shaft is supported by two
bearings, one in the cover and the other in the
housing . Oil seals are provided at both ends of the
shaft . Refer to Figure 1 1 - 1 7 .
This Fillet Area
Must Be
Completely Smooth
Crankpin Fillets.
Fig u re Gear Reduction U n i t - Exploded View.
1 1 -1 7.
threads, different mounting hardware is required .
The internally threaded crankshafts are sold in kits
which include the hardware . The m ounting hard­
ware can also be purchased separately.
NOTE:
1 . Use a 1 3/32 I . D . x 1 - 1 /4 O.D.
washer (Part No. 521 1 4 01 ) when installing
drive cups with a 1 - 1 /4 " Dia . spotface (ma­
chined , recessed area around mounting hole) .
These d rive cups are primarily used on Inter­
national Harvester applications , but may be
found on other applications . Therefore , use the
drive cup to identify which washer should be
used .
2 . Required for drive cups with 5/S " mounting
hole.
Removal
1 .
Drain lubricating oil from unit .
2 .
Remove four cap screws from gear housing
and slide cover off along drive gear.
3 .
Remove four cap screws holding gear housing
to engine .
4 .
Wash all parts and inspect shaft , bushing and
gear for wear. Replace worn parts.
5 .
Remove old o i l seals a n d install new seals (flat
side out) in the gear housing and cover.
l IS TH . plain
x
1 1 . 1 3