Hydro Neutral; Reverse Sensing Switch - Jacobsen R-311T Parts & Maintenance Manual

3.9

HYDRO NEUTRAL _________________________________________________________

If the mower "creeps" in either direction, the Neutral position
must be adjusted. The mower may tend to "creep" if the
hydraulic oil is cold. Operate mower for 15 minutes before
determining if adjustment is needed.
WARNING
!
Carbon monoxide in the exhaust fumes can be fatal
when inhaled. Any adjustments or repairs performed
while the engine is running must be made with ample
ventilation.
Never work on a mower that is supported only by the
jack. Always use jack stands.
If only the front or rear of the mower is raised, place
chocks in front of and behind the wheels that are not
raised.
1. Place a small amount of lubricating oil on all linkage
pivot points.
2. Hoist mower so all four tires are off the ground and
place jack stands under the frame to prevent accidental
lowering of the mower during adjustment.
3. Start engine and set throttle to full speed.
4. Disengage parking brake and place 2WD/4WD Switch
in 2WD position.
5. Check rotation of drive tires and adjust traction return
control (L) with the engine running.

3.10 REVERSE SENSING SWITCH ________________________________________________

1. Loosen switch hardware (R).
2. Adjust switch (S) so switch contacts are open with
switch roller contacting the adjustment block (T) and
the traction pedal in Neutral and close when pedal is
moved in the forward direction.
3. Secure switch adjustment and test operation.
4. If adjustment cannot be made, contact your authorized
Jacobsen Dealer.
ADJUSTMENTS
a. To adjust for forward creep, loosen nut (M), and turn
nut (N) in until tires stop rotating. Hold nut (N) in
place and tighten nut (M).
b. To adjust for reverse creep, loosen nut (M), and
turn nut (N) out until tires stop rotating. Hold nut (N)
in place and tighten nut (M).
6. If mower continues to creep, check position of traction
return control (L).
a. The return control (L) must be parallel to traction
arm (O).
b. Loosen hardware (P) and adjust bracket (Q) until
control is parallel to arm.
L
Q
L
N
M
O
P
MUST BE PARALLEL
Figure 3H
T
R
S
Figure 3I
3
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