Info needed about driveshaft on 1572 Diesel

[cfrock]

Hi Guys, I just recently joined up with you after reading thru your posts for about a year now. I have several super garden tractors and have recently purchased a model 1572 diesel. It needs a little TLC but the worst item on it is the driveshaft. It has some kind of a clutch on the back of it where it attaches to the hydro pump. This seems to be worn quite abit and has knocked out the oil seal in the hydro pump. I have talked to the parts man at the IH dealer and he says that there isn't much of it that is available from IH anymore. Is it possible to swap out this driveshaft for a regular type from another super garden tractor? Or should I just try and rebuild the original one? I seem to remember reading a statement from someone that did this but cannot find anything about it in the archives. }}

 

[jdiederichs]

Charles,

That clutch is a centrifugal clutch designed to help the diesel crank faster in cold weather. It allows the engine to crank without turning the hydrostatic pump. It was not used on later diesels, such as my 1782.

You can eliminate the clutch by using a straight drive shaft from a 1772 available through one of our sponsors listed above, or you local CC dealer. If you choose , you can make one using 4140 grade steel.

I believe that your dealer was correct, those clutch parts are a bit pricy IF you can find them. That was an example of a great idea not realizing it's potential due to an inferior design, so it probably isn't work the repair.

 

[jstertz]

Charles,

If you plan to have a fair amount of seat time in this little diesel tractor, I highly suggest swapping out that old "rag-joint" drive shaft for one of the "Cyclops" model CV drive shafts. I just completed the exchange on mine and I was amazed at how much smoother it runs from idle through WOT. I notice it the most at mid to higher RPM's. When you compare the two drive shaft units side by side it isn't hard to see why the CV joint model is so much smoother (better). There are many more flex points in the old setup and with the amount of torque and vibration coming from that little Kubota diesel, the old design just didn't have a chance over time. Good idea, bad design.

 

[ceckhardt]

What is a "cyclops" driveshaft?

 

[jchamberlin]

Camden: The term "Cyclops" is used to describe the MTD vintage tractors that featured a distinctive "integrated" headlight at the center of the grill. You may have seen pictures of them, the units are generally considered to have carried on the tradition of IH quality and introduced some helpful innovations, like an axle design with a tighter turning radius (the so-called "Super-Steer" axle). Below is a diagram of a "cyclops" Super GT Model 2086 hood:

The Model 2086 also has the CV axle design that Joshua references:

2086 CV Driveline Components (from Parts Lookup)
Tag Part # Description
1 717-3312 Pump, Hydrostatic | For components see listing of parts under details of hydrostatic pump.
710-3120 Bolt, Hex Patch Lock, 3/8-16 x 1.5 Lg GR5
2 721-3004 GASKET
3 723-3014 FILTER-HYDRAULIC O
4 721-3005 RING-O-5/8 OD TUBE
5 727-3009 Connector, 37 Degree
6 727-3027 Tube Assy Not Available
7 710-3212 Screw, Socket Hd Cap, 1/4-20 x 2.0 Lg
8 736-0329 WASHER-LOCK
9 748-3038 Adapter, Pump Not Available
10 736-0270 Washer, Bell, .265 x .75 x .062 Thk
11 710-3220 Bolt, Hex Patch, 1/4-20 x 1.0 Lg GR5
12 748-3030A Coupling, Drive w/O-Reg Groove
13 723-3022 Ball, Steel, 5/8 Dia Chrome
14 748-3044 HUB-DRIVE
15 721-3025 O-Ring, 2.489 x .070
16 735-3029 Boot, Coupling
737-3023 Grease, CV Polyrex
17 716-0171 RING-RETAINING
18 736-0463 WASHER-FL
19 731-3095 FAN-HYDRO
20 738-3149 Shaft, Drive, 25.18 Lg Not Available
21 710-3211 Screw, Socket Hd Cap, 1/4-20 x 1.75 Lg
22 737-3000 GREASE FITTING
23 748-3037 NUT-FAN 1/4-20
24 710-1304 Screw, Flat Hd Cnt Snk, M8 x 1.25 x 55 MM Lg Not Available
25 703-2823 Plate, Coupling Adapter

Note that the dimensions of the shaft for a CV driveshaft assembly are slightly longer than those for a standard-sized Garden Tractor, like an 1864:

1864 Driveline Components

1 717-3311 Pump, Hydrostatic | For components see listing of parts under details of hydrostatic pump
710-3120 Bolt, Hex Patch Lock, 3/8-16 X 1.5 Lg GR5
2 721-3004 GASKET
3 723-3014 FILTER-HYDRAULIC O
4 721-3005 RING-O-5/8 OD TUBE
5 727-3009 Connector, 37 Degree
6 727-3027 Tube Assy Not Available
7 710-3212 Screw, Socket Hd Cap, 1/4-20 X 2.0 Lg
8 736-0329 WASHER-LOCK
9 748-3038 Adapter, Pump Not Available
10 736-0270 Washer, Bell, .265 X .75 X .062 Thk
11 710-3220 Bolt, Hex Patch, 1/4-20 X 1.0 Lg GR5
12 748-3030A Coupling, Drive w/O-Ring Groove
13 723-3022 Ball, Steel, 5/8 Dia Chrome
14 748-3044 HUB-DRIVE
15 721-3025 O-Ring, 2.489 X .070
16 735-3029 Boot, Coupling
737-3023 Grease, CV Polyrex
17 716-0171 RING-RETAINING
18 736-0463 WASHER-FL
19 731-3095 FAN-HYDRO
20 738-3098 Shaft, Drive, 20.38 Lg
21 710-3211 Screw, Socket Hd Cap, 1/4-20 X 1.75 Lg
22 737-3000 GREASE FITTING
23 748-3037 NUT-FAN 1/4-20
24 710-3258 Bolt, Hex Patch, M8-1.25 X 50 MM Not Available
25 736-3008 WASHER-FL.344
26 719-3096 Adapter, Drive Shaft

Edit: I priced an assembly for a standard tractor recently at about $400 from my local dealer, your mileage may vary.

 

[jstertz]

Jeremiah--Thanks as always for the detailed description and diagrams for the CV driveshaft. You do a great job of making these things easy to understand.

Camden--Welcome to the forum!

I installed the CV joint drive shaft on my 1772 nearly two years ago and have been very pleased with the results. If you look up Donald Tanners "dog rebuild" thread in this section, you will find a detailed description of what he did to retrofit one for his 1572 including many pictures.

 

[ceckhardt]

Thanks for the clarification of "cyclops" It makes sense now. I will definetly check out Mr. Tanners thread. Thanks guys

 

[ceckhardt]

I finally got the adventure done! The driveshaft is back in and all is well once again. I'm gonna mow one last time then the blade will go back on. thanks for all the help, Cam