Yard Machines 840 Thru 849 사용자 설명서

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SECTION 10:  MAINTAINING YOUR GARDEN TRACTOR
WARNING: Disconnect the spark plug
wire(s) and ground against the engine
before performing any adjustments,
repairs or maintenance.
TROUBLE SHOOTING
Refer to the trouble shooting chart for information.
ENGINE 
Refer to the separate engine manual for engine 
maintenance instructions.
Maintain engine oil as instructed in the separate 
engine manual packed with your unit. Read and follow 
instructions carefully.
Service air cleaner every 25 hours under normal 
conditions. Clean every few hours under extremely 
dusty condition. To service the air cleaner, refer to the 
separate engine manual packed with your unit.
The spark plugs 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.
CLEANING ENGINE AND DECK
Any fuel or oil spilled on the machine should be wiped 
off promptly. Grass, leaves, and other dirt must not be 
allowed to accumulate around the cooling fins of the 
engine or on any part of the machine.
Clean the underside of the deck after each mowing.
CUTTING BLADES
WARNING: Protect hands by using heavy
gloves or a rag to grasp the cutting blades.
The blades may be removed for sharpening or 
replacement as follows:
Remove the hex flange nut that holds the blade to the 
blade spindle. See Figure 25.
Figure 25
When sharpening the blades, follow the original angle 
of grind as a guide. It is extremely important that each 
cutting edge be ground equally to prevent an 
unbalanced blade. An unbalanced 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. 
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. 
TORQUE SPECIFICATIONS
Blade
Hex Flange Nut: 840 in. lb. min., 1080 in. lb. max.
Blade Spindle Screws
If disassembled for any reason, tighten the blade 
spindle screws between 200 and 275 inch pounds.
WHEEL ADJUSTMENT
The caster (forward slant of the king pin) and the 
camber (tilt of the wheels out at the top) require no 
adjustment. Automotive steering principles have been 
used to determine the caster and camber on the tractor. 
The front wheels should toe-in between 1/16-5/16 inch.
Some units have adjustable tie rods so the toe-in can 
be adjusted. To adjust the toe-in on these units, follow 
these steps.
Remove the hex nut and lock washer, and drop the 
end of the tie rod from the axle bracket. See Figure 
26.
Loosen the hex jam nut on tie rod.
Adjust the tie rod assembly for correct toe-in.
Blade
Hex
Flange
Nut