87
g)
MOUNTING FLANGE FOR ENGINES WITH
LATERAL PTO
Reduction shaft service
A retaining ring secures the 8,5 : 1 PTO shaft. The
sequence of the washers is the most important factor to
consider for reassembly.
Insert PTO (Power Take Off) shaft through seal and into
flange bosses. Follow sequence of parts shown in
Fig 57.
NOTE - If base does not slide on crankshaft freely do
not force. Turn crankshaft 1/8 of a turn and repeat until
reduction gear in base plate rolls down worm gear on
crankshaft.
Always use new oil seal protector cap using proper
approved tools to install.
NOTE - If gasket surface of base plate does not contact
gasket surface of cylinder block, DO NOT FORCE. This
indicates oil pump gear, or governor gear, is not meshed
with crankshaft gear. Turn crankshaft slowly while
exerting light pressure on base plate until gears mesh,
at the same time ensuring that oil pump plunger is located
in base plate.
Fitting external parts
Position cylinder head and gasket on cylinder and insert
head bolts. Tighten as per torque figures given in tables.
Fit the breather body and secure refit carburettor and
ignition as in chapters G & E. Fit air shroud and starter.
7. OHV ENGINES
a)
OH Valve Train Service (Fig 58)
The biggest difference between the OH engine compared
to other rotary mower engines is the overhead valve
concept. Many of the same procedures for repairing the
OH engine are the same. The differences will be in
servicing the valve train. This section will emphasize those
changes.
The valve train consists of a cupped lifter. This cupped
lifter enables the ball shaped end of the push rod to seat
on the lifter. The push rod moves a valve rocker arm that
opens the valve.
Fig. 58 - Over Head Valve System.
1.
Push rod guide plate
2.
Valve rocker arm
3.
Push rod
4.
“Cupped” valve lifter
Fig. 58
Fig. 57
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