Step 4: check tire pressure – Troy-Bilt 1900678 User Manual

Page 9

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Photo 2-6:

Clevis attaches to bellcrank. Do not remove

alignment screw and nut during attachment steps.

IMPOFnANT

Whenever the handlebar height is changed, the posi

tion of the control rod clevis must be changed accord
ingly. Moving the handlebars changes the tension on the
upper control rod and this tension must be adjusted by

relocating the clevis in the appropriate bellcrank hole.
Refer to the “Handlebar Height Adjustment" instructions
in Section 5 for the correct procedure to follow.

D. Before the mower left the factory, the bellcrank was
rotated upward and secured in place with a #10-24 x
5/8" long Phillips head screw and #10 lockwasher/nut.
See Photo 2-6. This aligns the bellcrank. The bellcrank
must be aligned in this manner every time the control
rod clevis is relocated to a different bellcrank position
ing hole. Do not remove the screw and lockwasher/nut
at this time.

NOTE: If the screw and lockwasher/nut has been
removed, rotate the bellcrank upward and reinstall the

screw and lockwasher/nut.

E. Slide the arms of the clevis over the bellcrank, push
ing the clevis forward as far as it will go.
F. Pull the handle on the wheel drive lever all the way
back into its most reanward position and, while holding

the lever in this position, try to align the clevis hole with
the appropriate bellcrank hole.

Do not let the wheel

drive lever move from its most rearward position while
you are moving the clevis.

G. If the holes line up, insert the clevis pin through the
right side of the clevis and secure it with the spring
clip. See Photo 2-7. If the holes do not line up, remove
the clevis from the bellcrank and adjust the clevis by
rotating it up or down the control rod.

Repeat Steps E, F and G until the holes are

aligned.

Remove the screw and lockwasher/nut (shown in

Photos 2-6 & 2-7) from the bellcrank alignment holes.

You may have to jiggle the bellcrank slightly to free
them. Be sure to save the screw and lockwasher/nut
for any future readjustments of the upper wheel drive
control rod.

J. At this time, check to see that the wheel drive rollers

are not touching the rear tires. See Photo 2-8. With the

wheel drive lever in the upward, NEUTRAL position,
there should be a minimum clearance of 1/16" be
tween the rollers and the tires. This clearance ensures
that the rollers will not drive the wheels when the wheel
drive lever is in NEUTRAL. If there is not at least 1 /16"

of clearance, an adjustment must be made before the
engine is started. Please refer to Section 5, “Adjusting
Wheel Drive Traction” for the necessary adjustment
procedure.

Photo 2-8:

Check for minimum clearance of 1/16"

between rollers and tires. (Belt/pulley safety cover re

moved for photo clarity.)

STEP 4: Check Tire Pressure

Use a pocket-type tire pressure gage to check the

inflation pressures in the rear tires. See Photo 2-9. The

tires should be equally inflated to between 25-30 psi.
B.

Incorrect or unequal air pressure can result in ab

normal tire wear and difficult steering. On self-propelled
models, it can result in poor traction between the wheel
drive rollers and the tires. For best results, check the
inflation pressures after every 10 hours of operation or

once a week, whichever occurs sooner.

Photo 2-7:

Secure clevis with clevis pin and spring clip.

Photo 2-9:

Check tire pressures in rear tires.