JD 4310 mid-PTO shuts off during use?

tbestor · Jun 17, 2015

I have a JD 4310 compact utility tractor. When mowing with the belly mower, the PTO disengages. I can usually get about 30-45 minutes out of it, then it seems to warm up and the PTO shuts off. If I wait for 10 minutes, I might get 5 more minutes of mowing. Then the PTO stops turning on altogether. The tractor motor works fine- no overheating or lights. My guess is some sort of electronic component is heating up and turning off the electronic PTO. Thoughts?
Thanks Tim

kennyd · Jun 17, 2015

Welcome to TBN,
The mid (and rear) PTO is activated by a solenoid valve (#42 and 53 below), you can can check the connections to it, and also the resistance of the coil. Might be time to get a tech manual for your machine if your going to do your own wrenching, at $70ish they are worth their weight in gold.

Mid PTO Kit, Optional
Cart key PART NO. PART NAME QTY SERIAL NO. REMARKS
1 YZ81107 Cylinder 1 MID PTO ACTUATION
2 H21957 O-Ring 1
3 F37020114 O-Ring 1
4 YZ81108 Shaft 1 MID PTO SHIFTER
5 YZ81132 Spring 1
6 19M7803 Bolt 4 M8 X 70
7 YZ80162 Bushing 2 LOCATOR
8A YZ81080 Housing 1 ORDER YZ81450
8B YZ81450 Kit 1 Mid PTO Housing
9 19M7868 Bolt 1 M8 X 30
Cart key PART NO. PART NAME QTY SERIAL NO. REMARKS
10 YZ81451 Kit 1 SHIFTER FORK
11 F7112512MWK Spring Pin 1
12 YZ81415 Fork 1
13 YZ80777 Gear 1
14 F3901078 Snap Ring 1
15 F40104 Ball Bearing 1
16 F39000168 Snap Ring 1
17 YZ80089 Universal Driveshaft 1
18 F65282 Seal 1
19 YZ80139 Plate 1
Cart key PART NO. PART NAME QTY SERIAL NO. REMARKS
20 CH16469 Pin 2 PTO COVER
21 19M3147 Cap Screw 1 M10 X 35
22 F37030213 O-Ring 1
23 F40306 Ball Bearing 2
24 F39000281 Snap Ring 1
25 F21029 Cap 1 EXPANSION
26 F39000187 Snap Ring 1
27 YZ81273 Bearing 1
28 YZ81236 Drive Shaft 1
29 F5531828 Thrust Bearing Race 2
Cart key PART NO. PART NAME QTY SERIAL NO. REMARKS
30 YZ80776 Gear 1 Z=27
31 F5101816 Needle Bearing 1
32 F7112524HBK Spring Pin 1
33 YZ80492 Pin Fastener 1 STUB
34 F21021SC Cap 1 EXPANSION
35 F39000206 Snap Ring 1
36 F21037SC Cap 1 EXPANSION
37 F40304 Ball Bearing 1
38 YZ80775 Gear 1
39 YZ80781 Pin Fastener 1
Cart key PART NO. PART NAME QTY SERIAL NO. REMARKS
40 YZ81235 Gear 1
41 ...... Nut 1 (ORDER YZ81312)
42 YZ81353 Solenoid Valve 1 (W/ 2-PIN CONNECTOR)
43 YZ81305 Grinding Tool 1 (USE WITH YZ81312)
44 61M5015 Elbow Fitting 1
45 51M7040 O-Ring 1 9.300 X 2.200 mm
46 38H5015 Elbow Fitting 1
47 T77814 O-Ring 1
48 51M7040 O-Ring 1 9.300 X 2.200 mm
49 38H5001 Adapter Fitting 1
Cart key PART NO. PART NAME QTY SERIAL NO. REMARKS
50 T77814 O-Ring 1 1/4"
51 61M5001 Adapter Fitting 1
52 LVA11276 Hydraulic Hose 1
53 YZ81312 Valve 1 (W/ SCREEN)
54 F40302 Ball Bearing 1
55 YZ81268 Power-Takeoff 1 MID PTO
56 RE73096 Relay 3
57 M139089 Cover 1 PTO SHAFT
58 LVB25291 Kit 1 MID PTO

kennyd · Jun 17, 2015

Sorry, having trouble with inline pictures and tables this evening

tbestor · Jun 18, 2015

Thanks. I saw the three solenoids sitting side by side on the underside of the right fender/housing area, and wondered if one of them may be the culprit. I will try putting a test light on each one while the PTO is operating (no mower), and then again when it stops. Maybe I can isolate the bad one that way.
Thanks again.