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12

SECTION 6:  MAINTAINING YOUR LAWN MOWER

Cleaning the Lawn Mower

Clean underside of the mower deck after each use 
to prevent any build-up of grass. If this debris 
accumulates, it will cause rust and corrosion.

NOTE:  We do not recommend the use of pressure
washers or garden hose to clean your unit. These may
cause damage to electric components, spindles,
pulleys, bearings or the engine. The use of water will
result in shortened life and reduced serviceability.

Disconnect spark plug wire. Drain gasoline from the 
mower, or place a piece of plastic under gas cap.

Tilt the mower so that the side with the air cleaner is 
facing up. Hold the mower firmly.

Scrape and clean the underside of the deck with a 
suitable tool. Do not spray with water. 

Put mower back on its wheels and remove plastic.

Engine Maintenance

A list of key maintenance jobs required for good 
performance by the mower is given below. Follow the 
engine manual for detailed list and instructions. 

Change engine oil as specified in the engine 
manual. Check oil level before starting engine 
every time.

Service foam filter in the air cleaner as specified in 
the engine manual. Service air filter more frequently 
in extremely dusty conditions.

Clean engine periodically. Remove dirt and debris 
with a cloth or brush. 

Clean spark plug and reset the gap to.030” at least 
once a season or every 50 hours of operation. 

Inspect muffler periodically, and replace if 
necessary. Damaged mufflers or spark arresters 
can create a fire hazard. 

IMPORTANT: 

Make sure to avoid muffler and 

surrounding areas while the mower engine is hot 
because temperature of these areas of the engine may 
exceed 150

o

 F.

Lubrication 

(See Figure 12 ) 

Wheels

Lubricate the wheels and bearings, if so equipped, 
at least once a season with light oil or engine oil. 
Also, if the wheels are removed for any reason, 
lubricate the surface of the axle bolt and the inner 
surface of the wheel with light oil. 

Chute Deflector & Rear Discharge Door

Lubricate the torsion spring and the pivot point on 
each end of the rear discharge door using a light oil. 
This will prevent rusting.

Engine

Follow the engine manual instructions and 
recommended schedule for lubricating engine.

Pivot Points

Lubricate the pivot points on the discharge chute 
door, blade control handle and the cutting height 
adjustment lever at least once a season with light 
oil. The blade control handle must operate freely in 
both directions. The cutting height adjustment 
levers should be able to move easily.

Figure 12

WARNING: 

Always stop engine and 

disconnect spark plug wire before performing 
any maintenance or adjustments on the mower.

WARNING: 

Never tip mower more than 90 

degrees in any direction and do not leave it 
tipped for long. Oil can drain into the upper part 
of the engine causing a starting problem.

Lubricate

Follow engine manual
for lubrication

Lubricate

Lubricate

Summary of Contents for 437

Page 1: ...eting applicable local or state laws if any If a spark arrester is used it should be maintained in effective working order by the operator In the State of California the above is required by law Secti...

Page 2: ...plained below For future reference please copy the model number and the serial number of the equipment in the space below ENGINE INFORMATION The engine manufacturer is responsible for all engine relat...

Page 3: ...ne in bare feet sandals slippery or light weight e g canvas shoes 8 Do not put hands or feet near rotating parts or under the cutting deck Contact with the blade can amputate hands and feet 9 A missin...

Page 4: ...d fall can cause serious personal injury If you feel you are losing your balance release the blade control handle immediately and the blade will stop rotating within 3 seconds Do Not 1 Do not mow near...

Page 5: ...equipment manufacture s O E M blade only listed in this manual Use of parts which do not meet the original equipment specifications may lead to improper performance and compromise safety 4 Mower blade...

Page 6: ...LY Do not mow on inclines with a slope in excess of 15 degrees a rise of approximately 2 1 2 feet every 10 feet A riding mower could overturn and cause serious injury If operating a walk behind mower...

Page 7: ...laced on top of the unit Remove it from the unit and set it out of the way See Figure 2 Figure 2 Raise the lower handle as shown in Figure 2 until it snaps into place Raise the upper handle as shown i...

Page 8: ...before shipping proceed to the next section If it is unassembled follow the steps below Insert frame into grass bag with the black plastic side on the bottom of bag See Figure 7 Figure 7 Slip the side...

Page 9: ...e the illustrations in Figure 11 with your lawn mower to familiarize yourself with the location of various controls and adjustments Figure 11 Blade Control Handle The blade control handle is located o...

Page 10: ...l cap on the end of the spark plug wire is fastened securely over the metal tip on the spark plug Starting Engine Push the primer three times Wait two seconds between each push In temperatures below 5...

Page 11: ...ect in the bag as you run mower Operate mower till the grass bag is full Stop the engine completely by releasing the control handle Make sure that the unit has come to a complete stop Lift discharge d...

Page 12: ...e a season or every 50 hours of operation Inspect muffler periodically and replace if necessary Damaged mufflers or spark arresters can create a fire hazard IMPORTANT Make sure to avoid muffler and su...

Page 13: ...screwdriver See Figure 14 Remove metal from the heavy side until it balances evenly It is recommended that the blade always be removed from the adapter for the best test of balance Figure 14 Before re...

Page 14: ...clips in the inner holes of the weld pins and replace the carriage bolts and wing nuts on the handle brackets Attach the starter rope as instructed in the Assembling Your Lawn Mower section Adjusting...

Page 15: ...e Cause Corrective Action Engine fails to start 1 Blade control handle disengaged 2 Spark plug wire disconnected 3 Fuel tank empty or stale fuel 4 Blocked fuel line 5 Faulty spark plug 6 Engine floode...

Page 16: ...ARTS LIST FOR MODEL 437 1 6 10 3 2 11 4 5 4 19 35 33 32 29 30 51 41 40 46 24 22 21 20 25 42 44 44 12 31 31 30 29 28 26 27 44 44 49 43 18 36 38 45 48 34 14 13 37 39 25 52 47 16 23 7 8 9 12 15 55 54 53...

Page 17: ...ont Spring Lever 29 738 0507B Shld Bolt 5 Dia x 357 30 736 0105 Bell Washer 38 I D x 88 O D 31 738 0102 Front Axle Bolt 32 720 0426 Spring Lever Knob 33 732 0417A Rear Spring Lever 34 14578 Height Adj...

Page 18: ...such as lubricants filters blade sharpening tune ups brake adjustments clutch adjustments deck adjustments and normal deterioration of the exterior finish due to use or exposure d MTD LLC does not ext...

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