5-S7
ZD18(F) · ZD21(F) · ZD28(F), WSM
ELECTRICAL SYSTEM
[2] STARTING SYSTEM
(1) Checking
(A) Safety Switches
Method of Inspecting Each Control
A defective location can be judge by checking function of each
safety switch one by one as shown in the table below.
(Reference)
• Type of Safety Switch
Parking Brake Lever … Normal Close
Motion Control Lever … Normal Open
PTO Lever …… Normal Open
Operator Seat … Normal Open
W1016450
* In this part, the safety switch is a position of off. And it is a checked place.
** In this part, the voltage of the terminal of the engine stop solenoid is 0 V.
W1016546
 How to read meaning from table above.
After the engine start, for instance,
1. If the engine does not stop in combination 2 when leaving the seat, the seat safety switch is bad. Moreover, the
engine cannot be started without as every sitting on the seat.
2. If the engine starts with the parking brake released at combination 3, the parking brake safety switch is bad.
3. If the engine starts in combination 4 when the PTO lever is ON position, the PTO lever switch is bad.
4. If the engine starts in combinations 5 and 6 when the motion control lever is a Operating position, the motion
control lever safety switch is bad. Moreover, the engine stops if the parking lever is not released within two seconds
after the engine starts.
(1) Parking Brake Lever
(2) Motion Control Lever (LH)
(3) Motion Control Lever (RH)
(4) PTO Lever
(5) Operator Seat
(6) Key Switch
Combination
State of set such as operation levers Control operation
Motion
control lever
(LH)
Motion
control lever
(RH)
PTO lever
Parking
brake lever
Operator seat
Automatic
engine stop
Engine start
(Right or
wrong)
1
Parking
position
(Neutral)
Parking
position
(Neutral)
Off position
Lock position
On the seat
Keep
running**
Possible
2
Leave the
seat*
Impossible
3
Release
position*
On the seat
4 On position*
Lock position
5
Operating
position*
Off position
Stop few
seconds later
6
Operating
position*
Parking
position
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