Lift Limit Switches - Jacobsen 70528 Parts & Maintenance Manual

3.10 LIFT LIMIT SWITCHES _____________________________________________________

The rotation of the cutting blades is controlled by limit
switches positioned on the tractor frame near the lift arms
for each deck. When a deck is raised the switch opens
and automatically disengages the cutting blades. As the
deck is lowered, the switch closes and the blades
engage. If a switch fails, the cutting blades will not
engage when lowered.
To adjust limit switches:
1. Park tractor on a level surface.
2. Start tractor and raise or lower decks until the
highest point on the top corner of the deck reaches
the height shown in Figure 3K.
A
C
20 5/8 in.
(53 cm)
Side Decks
3. Shut off engine and remove key. Support decks
using blocks. This will prevent them from accidently
lowering while making adjustments.
4. Position switch so sensing area (C) on switch is
centered over leading edge (A) of activator plate on
lift arm.
5. Adjust gap between sensing area on switch and
activator plate on lift arm to 1/16"-1/8" (1.5 - 3 mm).
To adjust gap for front lift arm use shims (D) or #10
flat washers (B) between switch and switch mount.
Check operation of limit switches. Blades must stop
rotating as decks are raised above heights shown.
C
B
D
ADJUSTMENTS
A
21 in.
(61 cm)
Front Deck
Figure 3K
3
HR028
13