John Deere 655 broken seat switch

[JCMartin]

I have an old JD 655 tractor that i have been using to run a three point brush chipper off the rear PTO. Since I am out of the seat to use the chipper, I have been placing a block under the seat to depress the seat switch so that the PTO would stay engaged. I have always removed the block before getting back in the seat to move the tractor, but today forgot to do so. When I sat in the seat to move the tractor the seat switch was mashed down hard and the switch broke open. I did not realize this until I went to re-engage the PTO after moving the tractor. When I checked on the switch the plastic switch box had split open and the leads fell out. The PTO will now not engage.

Does anyone know if this switch is opens or closes the circuit when pressed? What would be the best way to bypass this switch?

I am suspecting something else is also wrong electrically since I cannot seem to bypass the switch to the get PTO going. I have tried with the circuit open, and closed in various combinations with the three leads that went to the seat switch. The magnet does not latch to the PTO lever no mater what I try. Is there a fuse or something else to check? Should the magnet be energized or not to engage the PTO. If I press the arm forward that the magnet is attached to the PTO will engage, so the problem has something to do with this circuit, but I have not been able to find enough information to know what to check.

 

[joecdeere]

I have a PDF of the Deere tech manual you're welcome to, it has all the wiring, but please don't ask anyone here how to bypass safety switches, that's a no no

Shoot me your email if you want the manual

Joe

 

[buickanddeere]

Should not be messing around with a block of wood. if the parking brake is set, the seat switch is bypassed to allow pto operation.
Expect a lawsuit or no insurance if safety equipment is broken or jumpered. Even if it doesn't involve the 655. jumpering something shows a general disregard for safety.

John Deere - Parts Catalog


PARK BRAKE AND SEAT INTERLOCK
Cart key PART NO. PART NAME QTY SERIAL NO. REMARKS
1 M91224 Lock Nut 1
2 14H785 Nut 1 5/16"
3 11M7080 Cotter Pin 2 2.500 X 16 mm
4 M74909 Rod 1 (SUB FOR M91218)
5 24M7055 Washer 2 8.400 X 16 X 1.600 mm
6 M74908 Compression Spring 1 (SUB FOR M46195)
M74908 Compression Spring 2 (EUROPEAN MODELS)
7 T60670 Spring 1 (SUB E79395 AND T67893)
8 M76621 Arm 1 NLA; HYDRO LOCK (SEAT ACTIVATED)
9 14M7166 Lock Nut 2 M8
Cart key PART NO. PART NAME QTY SERIAL NO. REMARKS
10 24H1294 Washer 3 11/32" X 1-1/8" X 1/16"
11 M91252 Spacer 2
12 19M7897 Screw 1 M8 X 35
13 M71884 Arm 1 HYDRO LOCK (PARK BRAKE ACTIVATED)
14 11M7080 Cotter Pin 1 2.500 X 16 mm
15 24M7055 Washer 2 8.400 X 16 X 1.600 mm
16 M91109 Rod 1
17 19M7184 Cap Screw 1 M8 X 55
18 M90248 Eccentric 1
19 M91255 Round Retainer 2 DUST
Cart key PART NO. PART NAME QTY SERIAL NO. REMARKS
20 M91256 Seal 2 FELT
21 AM118908 Pivot 1 (INCLUDES P1076H) (SUB FOR M73631)
22 JD5814 Lubrication Fitting 1
23 AM102489 Follower 1 NEUTRAL RETURN (NOT SHOWN) (INCLUDES M91373 BRONZE BUSHING) (SUB M114420, A M118908, (2) 03M7185 AND (2) 14M7396)
M114420 Follower 1 (SUB FOR M73655)
24 03M7185 Bolt 2 M8 X 25
25 AM102726 Ball Bearing 2
26 14M7396 Lock Nut 2 M8
27 M72498 Shim 1
28 19M7897 Screw 1 M8 X 35
Cart key PART NO. PART NAME QTY SERIAL NO. REMARKS
29 M91397 Extension Spring 1
30 M90253 Eyebolt 1 NLA; ORDER TCU51657
TCU51657 Eyebolt 1
31 11M7076 Cotter Pin 1 1.600 X 12 mm
32 34H252 Spring Pin 1 1/8" X 1-1/4"
33 M91103 Cam 1
34 11M7080 Cotter Pin 1 2.500 X 16 mm
35 24M7055 Washer 1 8.400 X 16 X 1.600 mm
36 AM102352 Shaft 1
37 14M7166 Lock Nut 1 M8
Cart key PART NO. PART NAME QTY SERIAL NO. REMARKS
38 T60670 Spring 1 (SUB E79395 AND T67893)
39 M91102 Rod 1
40 M91380 Washer 1
41 M91200 Washer 1
42 A1280R Spring 1
43 R52578 Knob 1

 

[pmsmechanic]

Some of you guys are so full of it it isn't even funny! How about assuming that he wants to bypass the switch so that the job can be finished and the next time the op goes to town he will purchase the proper switch and replace it. And that's assuming that the switch is presently available from John Deere. They might no longer supply the switch in which case the tractor is useless unless the switch is bypassed or modified.

 

[JCMartin]

Some of you guys are so full of it it isn't even funny! How about assuming that he wants to bypass the switch so that the job can be finished and the next time the op goes to town he will purchase the proper switch and replace it. And that's assuming that the switch is presently available from John Deere. They might no longer supply the switch in which case the tractor is useless unless the switch is bypassed or modified.

That would indeed be the case. I have found a replacement switch to order for $43.00 but the fact that no combination of connecting the three leads that went to the old switch will get me running again makes me think there is another problem. I don't have a schematic for this little thing, so I don't know how to check.

Setting the parking brake has never enabled the PTO on this tractor, so maybe something is amiss in the wiring.

 

[JCMartin]

joecdeere sent you a PM with my email

 

[yankeerider]

...
...Setting the parking brake has never enabled the PTO on this tractor, so maybe something is amiss in the wiring.

When operating the PTO on these tractors with no operator in the seat, you raise the seat and pull up on the safety switch to enable the PTO.

 

[buickanddeere]

PARK BRAKE AND SEAT INTERLOCK

 

[JOHND755]

Operating PTO without an operator in the seat only works if PTO selector is set to rear PTO.

 

[JCMartin]

Thanks. I wish I had known about pulling the switch up earlier as it would have saved me a lot of trouble.

Unfortunately, the replacement part shipped by Deere now does not have that function. The third lead on the connector is stubbed out and the switch only operates when depressed. I have not been able to find a replacement part that matches the behavior of the original part.