3-Point Hitch Pulsating 3 point hitch

   / Pulsating 3 point hitch #1  

RegL

Platinum Member
Joined
Aug 4, 2003
Messages
705
Location
Northwestern CT
Tractor
PT 1430
I have one of the now defunct Rhino Internationals that has developed a problem. With a heavy attachment raised on the 3ph, the hydraulics pulsate about once per second and the whole tractor jumps every time it does it. Also, with the tractor shut off, the 3ph bleeds down very quickly. I'm selling the tractor and don't want to stick someone with a big repair bill so looking for clues to what the trouble might be. Thanks.
 
   / Pulsating 3 point hitch #2  
Ordinarily - assuming no visible leaks anywhere - TPH leakdown suggests the lift piston seal, involving nothing more complicated than an O-ring/wiper replacement. Messy, but not difficult.

But the one second "jerking" symptom would probably have me looking at the relief valve first.

//greg//
 
   / Pulsating 3 point hitch #3  
I've got a Shennui with the same problem that I haven't taken time to repair but I had a response from Mike Stuart (Mike was one of the first Chinese tractor gurus) on the old CTOA board about this.
Quote "Your problem is inside the lift cover. Remove the seat, remove the top plate (off the lift housing). Start the tractor, raise the lift (with weight on it), you'll see some bubbles or oil squirting out around a plug on top of a rectangular block. Under this plug, is an o-ring that needs to be replaced. Be sure to let the lift down and turn off the tractor before unscrewing the plug, or you'll get an oil shower." End of quote.
If I'm not mistaken the Rhino and Shennui had many similarities in their designs so this might be worth checking. I need to get around to this yet myself.
Rick
 
   / Pulsating 3 point hitch #4  
In general.. refering to 3ph lift systems .. if you have a bad enough leak in the system fo rthe lift to visibly come down fast.. than the 'regeneration' can cause the jump. As the others mentioned..could be cyl pcking.. or things like sticking valves.. good luck.

Soundguy
 
   / Pulsating 3 point hitch
  • Thread Starter
#5  
Thanks to everyone. guess I'll have to take out the wrenches.
 

Tractor & Equipment Auctions

1989 Freightliner FLD120 (NEW CAT 3406A, NEW REAR ENDS, CLUTCH) (A51039)
1989 Freightliner...
30ft Pole S/A Towable Trailer (A49346)
30ft Pole S/A...
MAGNUM PRODUCTS 35KW GENERATOR (A50854)
MAGNUM PRODUCTS...
2018 Dodge Ram 5500 Bucket Truck - 4x4, Versalift VST40, 45FT Reach, Dakota Line Body (A51039)
2018 Dodge Ram...
2007 FREIGHTLINER BUSINESS CLASS M2 DUMP TRUCK (A51406)
2007 FREIGHTLINER...
Informational Lot - Shipping (A51039)
Informational Lot...
 
Top