Ariens HYDROSTATIC S-12 - Dwell Angle

Ariens dealers will provide any service which may be
required to keep the tractor operating at peak efficieriey. The
tractor is equipped with the finest quality engine obtainable.
However, shouid servicing be required, it can be obtained
from an Ariens dealer or an authorized ertgine manufacturer's
service station. Consult your Ariens dealer for details.
SEAT ADJUSTMENT
The Seat is adjustable forward and backward to seven
positions. To adjust seat position, grasp seat back and raise
røat. Slide the seat forward or backward as required to the
most comfortable position.
CAUTION; REAR AXLE MUST BE RAISED
AND BLOCKED SECURELY SO THAT REAR
WHEELS ARE FREE TO REVOL VE.
2. Loosen damp bolt B, Figure 18 and rotate the eccentric
until the flåts on the eccentric are parallel to the cam slot as
shown in Figure 18. Retighten bolt B. This will assure a
maximum fine adjustment range,.
3. With the Control fork, Figure 19, move the cam, Figure
18, until the cam follower roller is lined up with the cam
dwell center mark. DO NOT adjust the hydrostatic control
fork, Figure 19, if the control lever is not in the neutral slot
HYDROSTATIC CONTROL ADJUSTMENT
If the tractor creeps when the hydrostatic control lever is
in the neutral (N) position on the control console, make the
following adjustment:
The hydrostatic Controls shouid be adjusted so the tractor
dOes not creep forward or backward when the control lever is
in the neutral (N) slot in the control console as shown in
Figure 2. In addition, the control lever shouid automatically
be shifted to this position from either "forward" or "reverse*'
when the neutralizer pedal is fuHy depressed. '
CAM
DWELL ANGLE
m / /K dwell CENTER
//\.MARK
ECCENTRIC-
PINTLE LE VER-
PINTLESHAFT
of the console. This is the final adjustment to be made.
4. Depress free-wheeling valves by rotating cam up. See
Figure 6.
5. Loosen pintle lever damp bolt A, Figure 18, a sufficient
amount to allow the pintle lever to move freely. Move the
hydrostatic control lever, Figure 19, in the park-start position,
start the engine and run at idle. Return the control lever to
the neutral slot in the control console.
6. Release the free-wheeling valves by rotating cam down,
Figure 6. NEUTRALIZER PLATE
JAM NUTS
CAM
FOLLOWER/
ROLLER /,
O NEUTRALIZER
y
SHIFT ROD
JAM NUTS
ILLUSTRATED AS VIEWED
FROM RIGHT HÅND SIDE OF MACHINE
FIGURE 18
1. Jack up the rear of the tractor until the drive wheels clear
the ground and BLOCK SECURELY. Wheels must be free to
revolve.
2. With the control lever in "park-start" position, raise the
rear deck. Activate seat switch to allow engine to start.
3. Start engine; place control lever in the neutral position and
increase engine speed to full throttle. .
4. Loosen damp bolt B, Figure 18 a sufficient amount
to allow the cam follower to rotate. Turn the eccentric
"clockwise" or "counter-clockwise" as required until the
rear tractor wheels completely stop. Retighten damp bolt B.
Check adjustment by moving the control lever to both
forward and reverse positions several times. Each time the lever
is returned to neutral, the rear wheels shouid stop com¬
pletely if they drift, re-adjust the eccentric until a true neutral
position is found.
A CAUTION: USE EXTREME CAUTION WHEN AD-
JUSTING THE HYDROSTATIC UNKAGE WITH
THE ENGINE RUNNINGDUE TO THE ROTATING
DRIVE SHAFTCOUPLING AND FAN.
k If a positive neutral cannot be found by adjusting the
r eccentric, it will be necessary to adjust the hydrostatic
linkage using the following procedure:
1. Use steps 1 and 2 of the previous procedure.
CAUTION: WHEELS MAY TURN WHEN FREE-
WHEELING CAM IS RELEASED. KEEP ARMS
AND LEGS CLEAR AT ALL TIMES.
Check that the cam follower roller is lined up with cam
dwell center mark. Move the pintle arm back and forth
until wheels stop turning. Carefully tighten bolt A, Figure 18.
The neutral adjustment is extremely sensitive and this pro¬
cedure is a course adjustment. If, when bolt A is tightened, the
wheels still move slowly, the fine tuning will be done in step 9.
7. Loosen (4) jam nuts on neutralizing plate, Figure 18, and
depress neutralizer pedal completely, Figure 3. The cam
follower roller, Figure 18, shouid remain in line with the cam
dwell center mark. Snug (4) jam nuts up against neutralizer
plate. Release pedal and securely tighten jam nuts.
8. Check the hydrostatic control lever. If the neutralizer
pedal does not automatically shift the control lever to the
neutral position from either "forward" or "reverse" when
the pedal is fully depressed, loosen hydrostatic control fork
adjustment bolt D, Figure 19. Move the fork so that italigns
with the neutral slot in the control console. Securely tiahten
bolt D.
9. If the wheels still move slowly when neutralized, increase
the engine speed to full throttle. Loosen damp bolt B,
Figure 18 and adjust the eccentric roller until the wheels
stop completely. Tighten damp bolt B, Figure 18.
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