Forward Sensing Switch; Parking Brake - Jacobsen HR 9016 Turbo Parts & Maintenance Manual

3.9

FORWARD SENSING SWITCH _______________________________________________

The forward sensing switch allows the mower to operate
in four wheel drive only with the traction pedal in its
forward position. When operating in reverse the switch
opens and returns the mower to two wheel drive. If four
wheel drive fails to operate, check adjustment and
operation of sensing switch.
1. Make sure drive pump, traction pedal linkage, and
neutral sensing switch are adjusted to neutral,
Sections 3.6, 3.11, and 3.8.
2. Adjust switch so gap between sensing surface on
switch and edge of activator plate is between 1/16 -
1/8 in. (1.5 - 3 mm).
3. Disconnect switch from wiring harness and connect
a continuity meter across switch leads (B). With
traction pedal in neutral, slide switch back until it
opens, then forward until it closes. Secure switch in
this position.
4. With continuity meter still attached check adjustment
by pressing traction pedal.
Switch closed - traction pedal in neutral and during
full forward range of pedal.

3.10 PARKING BRAKE _________________________________________________________

The brake switch is part of the Interlock System and
senses when the parking brake is engaged. If this switch
fails, the machine may not start and the Interlock System
will not operate correctly.
To adjust switch:
1. Place the parking brake in its full upright (engaged)
position.
2. Adjust switch (C) by pivoting switch mounting
bracket (B). Align sensing area on switch with brake
handle (D).
3. Adjust gap between sensing area on switch and
brake lever to 1/16 - 1/8 in. (1.5 - 3 mm). To adjust
gap use shims (E) or #10 washers (F) as required
between switch and switch mount.
4. When properly installed, the switch will be closed
when the parking brake is engaged and open when
the brake is disengaged.
Important: Always check operation of Interlock System
after replacing or adjusting switch. (See Safety and
Operation Manual)
Switch open - Full reverse range of pedal.
5. Connect switch to wiring harness and check
operation of four wheel drive.
1/16" - 1/8"
(1.5 - 3 mm)
D
ADJUSTMENTS
Figure 3J
C
F
E
B
Figure 3K
3
B
HR012
HR020
en-15