JD300/1020 hydrulic problems

[Anonymous-0]

My boss here has an older 60's-70" JD 300 (like the 1020 from what I understand) that he uses a few times a year. Recently changed the filter, and a hydrulic hose, and fluid. Everything seemed to be working fine for a few hours, but after sitting outside (Wisconsin winters time) upon starting the tractor it blew the filter housing right off of the loader, snapped the 5/8" bolt clean off. Not only once but twice now so it's not a fluke accident. Any ideas what could be causing this? We have virtually no info or knowledge of how this system works.

 

[JDemaris]

Need more specifics to attempt any intelligent comments.

The 300 industrial usually has a much bigger hydraulic pump than the ag 1020. 300 often has the 2.4 or 3 c.i. pump and the 1020 can have the little .6 or 1.3 c.i. pump.

You might just have a problem of oil too thick and the filter relief not being able to handle the cold-flow of oil. The OEM Deere HyGuard trans/hyd oil is too thick for temps below 20F. That's why Deere sells a special winter-grade HyGuard that is 10W instead of 20W.

 

[Anonymous-0]

That could very well be the problem. I think he put a 32 wt oil in there. It's been about 25* out here lately. Will try some 10 wt and see what happens.


Also could an over filled oil level cause this? After it blew the filter housing off this past time, no more oil was added and it seems to be working, so far today.

 

[buickanddeere]

If the transmission/hydraulic system doesn't have a wet clutch compatible oil with extreme pressure protection. Your boss is going to find out that saving money on the wrong oil and not using the service manual. Is going to cost more in repairs than what the tractor is worth.
Your boss should consider himself lucky it was only the filter cover bolt. And not the brakes, pto clutch, pto brake and high/low shift clutch pack.
The system now requires a complete and total,drain,flush and fill with Hy-Gard.
1-800-522-7448

 

[buickanddeere]

http://www.imperialoil.ca/Canada-English/Files/Products_Lubes/IOCAENINDESHydraulic_Oil_AW.pdf

 

[tim s]

The oil level has nothing to do with this problem,Cold oil, ,,cold heavey oil, and a frosted filter relief valve unable to dump the pressure build up could cause it, I wonder how the pressure pipe from the pump to the filter port handled this burst of pressure..I have seen filters blow off of 4430's when the clutch oil pressure was shimmed to high to try makeing the perm-clutch hold better on pulling tractors.

 

[Roy Suomi]

I ran into this years ago on a Deere 400 loader-backhoe..It blew the transmission filter right off when the bolt broke...In this case it was ice in the hydraulic oil causing the filter relief valve to stick shut..Is your oil milky looking ??