Parking Brake; Neutral Adjustment - Jacobsen 70528 Parts & Maintenance Manual

3.6

PARKING BRAKE _________________________________________________________

The brake switch is part of the operator back-up system
and senses when the parking brake is engaged. If this
switch fails the machine may not start and the operator
back-up 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" (1.5 - 3 mm). To adjust
gap use shims (E) or #10 washers (F) as required
between switch and switch mount.
3.7

NEUTRAL ADJUSTMENT ___________________________________________________

Important: The neutral adjustment on the drive pump is
preset at the factory on all new tractors and replacement
pumps. Further adjustment is required only if the pump
has been disassembled for service or neutral lever
bracket (F) has become loose.
To adjust neutral on pump:
1. Disconnect traction pedal linkage from pump.
Remove switch mounting bracket from pump.
2. Place tractor securely on jack stands so All wheels
are raised off ground.
3. Check that tow valve (H) is completely closed.
4. Loosen screws (G) holding pump return arm bracket
just enough so it can be moved.
5. Engage parking brake and set PTO switch to
neutral.
The neutral sensing switch must be closed in order to
start the tractor. At this point the switch may not yet
be assembled to pump. To close switch so engine
can be started, place it face down on metal frame.
6. Start engine and observe wheels. Rotate bracket (F)
in slotted holes until wheels do not turn. Turn off
engine and tighten bracket in place.
7. Connect traction pedal linkage, Section 3.11, and
install and adjust switches, Sections 3.8 and 3.9.
8. Start engine and check operation of traction pedal.
Wheels must not turn when pedal returns to neutral.
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 operator back-up system after
replacing or adjusting switch. (See Safety and Operation
Manual)
D
K
ADJUSTMENTS
C
F
E
B
Figure 3G
F
H
G
Figure 3H
3
HR020
HR027
11