3-Point Hitch JD 4400 HST tractor bogs down like something is binding

[Leyenda30]

I've had the tractor at the dealership for over a month while they tried to diagnose the problem but it remains. The motor seems to have good power but in all 3 gear ranges it feels like it is bogging down. There are no grinding noises or signs of heat. I thought about the transmission suction screen clogged but they said that didn't affect it. The hydraulics seem to work well FEL, rear lift and steering. The bill is getting bigger but no fix. Has anyone had a similar problem or any insight to the problem. The tractor has about 1700 hours on it.

JP

 

[Verticaltrx]

Check to see if the brakes are dragging.

I'm going from memory here since it's been several years since we owned a 4400, so bear with me. On these tractors there is a shaft that goes into the transmission housing that actuates the brakes. I can't recall if it goes all the way through or there is one on each side, but it you get up under the tractor you will see what I mean. Best I can remember it is just a steel on steel pivot and it can eventually get rust in there and not let the brakes release. We had to take ours apart once and clean up the shaft(s) and lubricate them a little with some grease, anti-seize or whatever. Hope this helps.

 

[kennyd]

^^^^^^^^^^^^^^^
What he said, it was a common problem on the 4x00 and 4x10 series. The little return springs also often broke.

 

[john_bud]

Pretty shocked the dealer (or is it stealer in this case?) didn't go right to the brake issue!

Do check, that's should be it.

 

[Leyenda30]

Thanks guys for the quick replies. I contacted the dealer and suggested they look at the brakes more closely. In their defense they deal mostly in large excavators but have done other work well for me. The tractor set out for a time before our building was finished...so lesson learned to keep it dry. JP

 

[kennyd]

No, not keep dry...just keep moving parts lubricated, Fluid Film works great for things like this. I can post a pic from JDP later if that will help. There is a shaft and a spring on each side.

 

[Leyenda30]

A pic would help because this is going to be an ongoing issue. The forward and reverse pedals are tight as well. I live close to the coast so salt air probably has something to do with it also. JP

 

[john_bud]

This stuff is good too.
Corrosion Inhibitor & Anti-Corrosion Spray | Corrosion Protection

 

[kennyd]

As promised:

Here is the pedal assembly, #18 are the return springs that often break:


BRAKE SHAFT, PEDALS AND LINKAGE (HYDRO)
Cart key PART NO. PART NAME QTY SERIAL NO. REMARKS
1 M132102 Nut 1
2 H86608 Washer 1
3 LVU10491 Pedal 1 - XXXXXX MASTER BRAKE, (SUB FOR M133145) (SUB LVU10639)
LVU10639 Pedal 1 XXXXXX - MASTER BRAKE
4 LVU10635 Cam 1 PARK BRAKE
5 19M7897 Bolt 2
6 M133474 Shaft Key 1
7 LVU15583 Extension Spring 3 (SUB FOR M131826 OR LVU11293)
8 M134817 Bushing 2
9 M128499 Sleeve 2
Cart key PART NO. PART NAME QTY SERIAL NO. REMARKS
10 M126827 Spacer 1
11 M134816 Sleeve 1
12 JD7759 Lubrication Fitting 1
13 AM123763 Support 1
14 M139206 Rod 2 RH THREAD
15 14M7275 Nut 2 M12
16 M139285 Turnbuckle 2
17 14M7146 Nut 2 M12 LH THREAD
18 LVU11264 Extension Spring 2 (SUB FOR M131825)
19 11M7059 Cotter Pin 6 3.200 X 20 mm
Cart key PART NO. PART NAME QTY SERIAL NO. REMARKS
20 24M7040 Washer 6 11 X 20 X 2 mm
21 YZ80935 Bellcrank 1 RH BRAKE, (SUB FOR YZ80848)
22 M139205 Rod 2 LH THREAD
23 M128078 Lever 1
24 ...... Washer 1
25 19M7407 Cap Screw 2 M8 X 25
26 14M7298 Flange Nut 4 M8
27 M135397 Lever 4
28 M134814 Bushing 4
29 LVU10676 Shaft 1 (SUB FOR M125045)
Cart key PART NO. PART NAME QTY SERIAL NO. REMARKS
30 LVU10492 Pedal 1 RH BRAKE, (SUB FOR M130194)
31 LVU10677 Shaft 1 (SUB FOR M134524)
32 M134525 Spacer 1
33 YZ80934 Bellcrank 1 LH BRAKE, (SUB FOR YZ80846)
34 40M7080 Snap Ring 1
35 LVA10269 Pedal 1 LH BRAKE, (SUB FOR AM126663)
36 M131839 Bushing 1
37 19M8329 Cap Screw 1 M6 X 50
38 14M7194 Nut 1 M6
39 M136842 Lock Nut 1
Cart key PART NO. PART NAME QTY SERIAL NO. REMARKS
40 LVU10674 Shaft 1 BRAKE, (SUB FOR M128077)
41 M125042 Rod 1 LH UPPER
42 M125060 Rod 1 RH UPPER
43 19M7374 Cap Screw 2 M6 X 40
44 14M7194 Nut 2 M6
45 14M7274 Nut 4 M10
46 M125044 Pin Fastener 2 ADJUSTMENT




And here rear, parts, the shafts #4 are what binds up where they go through the housings.


BRAKE DISKS AND PLATES
Cart key PART NO. PART NAME QTY SERIAL NO. REMARKS
1 YZ80935 Lever 1 BRAKE, RH AXLE HOUSING
2 F7131224HBK Pin 2 7.925 X 38.100 mm
3 F37020113 O-Ring 2
4 YZ80598 Cam 2
5 YZ80748 Plate 3 FRICTION
6 YZ80981 Brake 1 RH AXLE
7 YZ80934 Lever 1 BRAKE, LH AXLE HOUSING
8 YZ80855 Universal Driveshaft 1 BRAKE, LH AXLE
9 19M7662 Cap Screw 5 M10 X 30
10 YZ80982 Brake 1 LH AXLE
Cart key PART NO. PART NAME QTY SERIAL NO. REMARKS
11 YZ80856 Universal Driveshaft 1 BRAKE, RH AXLE

 

[RG1]

If your brakes are hanging up as noted, your hydro pedals will be stiff because the brakes are keeping the machine form rolling while the pedals are trying to open the valves either way to allow the fluid to move, which it can't while the brakes are still applied.