Maintenance – Bolens 112-340A User Manual

Page 10

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MAINTENANCE

CUTTING BLADE

A. Removal for Sharpening or Replacement

) WARNING \

Be sure to disconnect and ground

the spark plug wire before working
on

the

cutting

blade

to

prevent

accidental engine starting.

1. Remove the large bolt and lock washer which

holds the blade and adapter to the engine
crankshaft.

2.

Remove the blade and adapter from the

crankshaft. Be careful not to lose the key on
the crankshaft.

3. If the blade or blade adapter needs replacing,

remove the two small bolts, lock washers and
nuts which hold the blade to the adapter.

B. Sharpening

Remove the cutting blade by following the direc­
tions of the preceding section.

When sharpening the blade, follow the original
angle of grind as a guide. It is extremely important

that each cutting edge receives an equal amount
of grinding to prevent an unbalanced blade. An un­

balanced

blade

will

cause

excessive

vibration

when rotating at high speeds, may cause damage
to the mower and could break, causing personal

injury.

The blade can be tested for balance by balancing

it on a round shaft screwdriver. Remove metal

from the heavy side until it balances evenly.

NOTE

It is recommended that the blade

always be removed from the adapter
for the best test of balance.

C. Reassembly

Before reassembling the blade and the blade

adapter

to

the

unit,

lubricate

the

engine

crankshaft and the inner surface of the blade
adapter with light oil. Lubricating the bolt holes,
bolts and inner surface of the nuts with light oil is
also recommended. A 4 oz. plastic bottle of light
oil

lubricant

is

available.

Order

part

number

737-0170. Engine oil may also be used.

When replacing the blade, be sure to install the

blade with the side of the blade marked “Bottom”

(or with part number) facing the ground when the

mower is in the operating position. Make certain
key is in place on the crankshaft.

Blade Mounting Torque

3/8" Dia. Bolt 375 in. lb. min., 450 in. lb. max.
5/16" Dia. Bolt 150 in. lb. min., 250 in. lb. max.

To insure safe operation of your unit, ALL nuts
and bolts must be checked periodically for correct
tightness.

DECK

The underside of mower deck should be cleaned
after each period of use as grass clippings, ieaves,
dirt and other matter will accumulate. This ac­
cumulation of grass clippings, etc., is undesirable
as it will invite rust and corrosion and may cause
an uneven discharge of grass clippings at the next
cutting.

The deck may be cleaned by tilting the mower for­
ward or on its side and scraping clean with a
suitable tool or by washing with a stream of water
from a garden hose.

A

CAUTION

Do not direct the stream of water at

a hot engine as damage to the
engine may result.

ENGINE OIL

Check oil level before starting engine and after
every 5 hours of operation. ADD oil as necessary
to keep level full to point of overflowing. Before
removing oil fill plug, clean area around plug to

prevent dirt from entering oil fill hole. Engine

should be in a level position when checking oil.

Change

oil

after

first

5

hours

of

operation.

Thereafter change every 25 hours. Change oil
while engine is warm. Oil may be drained thru
drain on bottom of engine. To drain completely,
always place engine level when draining thru the

bottom. Oil capacity 1V4 pints. See figure 16.

10

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