Hydrostatic Transmission Neutral Adjustment; Adjusting Unit To Track Straight - Ariens 915037 Service Manual

b. Measure outer edge of mower blades to ground.
Measurement must be within 1/4 inch (6.35 mm).
• If mower deck is not level, repeat steps 5 and 6.
• If mower deck is level, record the distance from
rear edge of mower blades to the ground and then
adjust pitch of mower deck.
Adjust Pitch of Mower Deck
IMPORTANT: The mower blade end used to level the
mower deck must be used to adjust the pitch of the
mower deck.
1. Rotate the right and left mower blades 180 degrees
until the end of the mower blade that was used to
level the mower deck is facing forward (Figure 7).
NOTE: The front blade cutting height should be 1/16 -
1/4 in. (1.59 - 6.35 mm) lower than the rear blade cut-
ting height (Figure 7).
2. Measure from front edge of right and left mower
blades to the ground.
3. Subtract front blade cutting height measurement
from rear blade cutting height measurement
(Figure 7).
4. Perform steps 5 though 7 if the front blade cutting
height is too high or too low on either side on either
side of mower deck.
5. Remove front lift link and front trunnion from mower
deck and mower lift (Figure 5).
• TO RAISE the mower deck, turn front trunnion
clockwise several turns.
• TO LOWER the mower deck, turn front trunnion
counterclockwise several turns.
6. Install front trunnion and front lift link on mower
deck and mower lift.
7. Check mower deck pitch.
• If mower deck pitch is not correct, repeat steps 2
through 6.
• If mower deck pitch is correct, the adjustment is
complete.
4.6 HYDROSTATIC TRANSMISSION
NEUTRAL ADJUSTMENT
1. Shut off engine.
2. Position rear wheels off the ground. Be careful to
secure the unit to the lift or position the unit to face
a wall for safety. Disconnect the rods from the
handlebars to the linkage.
3. Engage seat switch and start the engine.
Disengage the parking brake. The drive wheels
should not be rotating. If the wheels are not driven
to rotate, proceed to Steering Control Neutral
Adjustment.
To adjust the neutral setting for no wheel rotation:
4. Use a hex wrench to loosen the locking bolt (Figure
8) until the linkage can be rotated by hand.
5. With the engine running and the drive wheels off
the ground, rotate the linkage in either direction.
The correct linkage position is obtained when the
wheel is not being driven (under power).
6. Hold the linkage in place and tighten the locking
bolt.
7. Shut off engine and reconnect steering rods.
8. Check parking brake linkage for proper movement.
4
3
2
1. Locking Bolt
2. Reverse Arm
4.7 ADJUSTING UNIT TO TRACK
STRAIGHT
Tires must be inflated to specifications, drive units
should be adjusted for neutral.
NOTE: Before making the following adjustments;
check the dampener on each of the steering handles. It
is possible that the fixed position of the dampener is
limiting the travel of the steering arm. To adjust the
dampener arm; loosen the dampener anchor nut to
allow movement. Tighten when done.
1. Start engine and warm up hydraulics.
2. Operate the unit and position it with adequate
running space.
3. Push both handles to full forward. The unit should
travel in a straight line. If the unit steers to one
side, adjustment is needed. Make note of which
way the unit is turning. Adjustment will be made to
the drive unit on the opposite side off the direction
of the turn. This is the faster wheel.
4. Loosen the jam nuts on the transaxle rod.
5. Screw the nyloc jam nut further down one or two
turns (depending on the amount of turning that
needs correction).
4 - 13
1
3. Forward Arm
4. Return Spring
Figure 8