Columbia 978, Operator'S Manual

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6

WARNING

Figure 11

Lubrication

1.  Lubricate the pivot points on the blade control handle 

at least once a season with light oil. The blade 

control must operate freely in both directions. See 

Figure 11.

2.  If your mower is equipped with ball bearing wheels, 

lubricate at least once a season with a light oil, all 

other types require no lubrication. However, if the 

wheels are removed for any reason, lubricate the 

surface of the axle bolt and the inner surface of the 

wheel with light automotive oil.

3.  Lubricate the torsion spring and pivot point periodi-

cally with light oil to prevent rust. See Figure 11. 

4.  The transmission is pre-lubricated and sealed at the 

factory and does not require lubrication.

5.  Follow the accompanying engine manual for lubrica-

tion schedule and instruction.

Engine

1.  Refer to the separate engine manual for engine 

maintenance instructions. 

2.  Maintain engine oil as instructed in the separate 

engine manual packed with your unit. Read and 

follow instructions carefully. 

3.  Under normal conditions service air cleaner as in-

structed in the separate engine  manual packed with 

your unit.  Clean every few hours under extremely 

dusty conditions. Poor engine performance and 

flooding usually indicates that the air cleaner should 

be serviced.

4.  The spark plug should be cleaned and the gap 

reset once a season. Spark plug replacement is 

recommended at the start of each mowing season; 

check engine manual for correct plug type and gap 

specifications.

NOTE: This spark ignition system meets all require-

ments of the Canadian Interference-Causing Equipment 

Regulations.

5.  Clean the engine regularly with a cloth or brush. 

Keep the cooling system (blower housing area) clean 

to permit proper air circulation which is essential to 

engine performance and life. Be certain to remove all 

grass, dirt and combustible debris from muffler area.

Deck

The underside of the mower deck should be cleaned after 
each use to prevent a buildup of grass clippings, leaves, 
dirt or other matter. If this debris is allowed to accumulate, 
it will invite rust and corrosion, and may prevent proper 
mulching. 
The deck may be cleaned by tilting the mower and scrap-
ing clean with a suitable tool (make certain the spark plug 
wire is disconnected).

Replacing Rear Flap 

The rear flap is attached to the back of the mower deck. If 
the rear flap becomes damaged replace it. 
1.  To remove rear flap, lift rear door, remove screw, and 

press flap in on either side to remove from hole.

2.  Remove screw and flap from opposite hole and 

replace with new flap in the opposite order and 
manner of removal.

Six speed shift cable adjustment

Periodic adjustment of the six speed shift cable may 
be required due to normal stretch and wear on the 
cable. Adjustment is needed if all six speeds cannot be 
obtained.
The adjustable cable bracket is located on the left side 
of the mower, beside the engine. Start engine and place 
shift lever in the sixth speed position. Stop engine and 
disconnect spark plug wire and ground it against engine.
1.  Loosen the hex nut which secures the adjustable 

cable bracket. See Figure 12. 

2.  Pull backward on the bracket (toward the rear of the 

mower). 

3.  Tighten the hex nut.

Lubricate these 

points before 

reassembly.

Always stop engine, 
disconnect spark 
plug, and ground 
against engine before 
cleaning, lubricating 
or doing any kind of 
maintenance on your 
machine.

Cutting grass in 
sandy soil condition 
causes abrasive wear 
to the blade.

If unit is tipped for 
easier access to 
blade or belt, tip 
mower as specified 
in separate engine 
manual. If it does not 
specify turn mower 
on its side making 
sure that the air filter 
and the carburetor 
are up.

Maintenance

1

2

3

Figure 12