Jacobsen 68131 Safety, Operation And Maintenance Manual - Caution

OPERATION    5

23

5

   OPERATION

5.1   DAILY INSPECTION ________________________________________________________

1.

Perform a visual inspection of the entire unit, look for 

signs of wear, loose hardware, and missing or 

damaged components. Check for fuel or oil leaks to 

ensure connections are tight and hoses and tubes 

are in good condition.

2.

Check the fuel supply, radiator coolant level, 

crankcase oil and air cleaner indicator. All fluids 

must be at the full level mark with engine cold.

3.

Make sure all mowers are adjusted to the same 

cutting height.

4.

Visually check tires for proper inflation.

5.

Test the interlock system.

Note:  For more detailed maintenance information, 

adjustments and maintenance/lube charts, see the 

Sections 6, 7, and 8.

5.2

INTERLOCK SYSTEM ______________________________________________________

1.

The interlock system prevents the engine from 

starting unless the parking brake switch is ON, the 

traction pedal is in neutral and the PTO switch is 

OFF. The system also stops the engine if the 

operator leaves the seat with the PTO switch ON, 

traction pedal out of NEUTRAL, or parking brake 

switch OFF.

2.

Perform each of the following tests to insure the 

interlock system is functioning properly. Stop the 

test and have the system inspected and repaired if 

any of the tests fail as listed below:

l the engine does not start in test 1;

l the engine does start during tests 2,3 or 4;

l the engine continues to run during tests 5 or 6.

3.

Refer to the chart below for each test and follow the 

check (4) marks across the chart. Shut engine off 

between each test.

Test 1: Represents normal starting procedure. The 

operator is seated, parking brake switch is ON, the 

operator’s feet are off the pedals, and the PTO switch 

is OFF. The engine should start.

Test 2: The engine must not start if the PTO switch is 

ON.

Test 3: The engine must not start if the parking brake 

switch is OFF.

Test 4: The engine must not start if the traction pedal 

is pressed.

Test 5: Start the engine in the normal manner then 

turn PTO switch ON and lift your weight off the seat. 

H

Test 6: Start the engine in the normal manner then 

turn parking brake switch OFF and lift your weight off 

the seat. H

H

 Lift your weight off seat. The cutting units must stop rotating within seven (7) seconds.

CAUTION

The daily inspection should be performed only when 

the engine is OFF and all fluids are cold. Lower 

mowers to the ground, engage the parking brake, stop 

engine, and remove ignition key.

!

WARNING

Never operate equipment with the Interlock 

System disconnected or malfunctioning. Do not 

disconnect or bypass any switch.

!

 Interlock System Check

Test

Operator 

Seated

Parking 

Brake Switch

Traction Pedal 

in Neutral

PTO 

Switch

Engine 

Starts

Yes

No

On

Off

Yes

No

On

Off

Yes No

1

4

4

4

4

4

2

4

4

4

4

4

3

4

4

4

4

4

4

4

4

4

4

4

5

4

H

4

4

4

H

6

4

H

4

4

4

H