B 7100D 3 pt hitch wont lift 100 lbs

[silversink]

I have cleaned the screen , put new 80wt in, put a new o ring and backing ring on the piston, cleaned the control valve and relief valve, haven't pulled the pump yet. any suggestion's ? I have downloaded the manual.

 

[boz1989]

80wt? I don't know much about this machine, but I think that might be an issue. Others more knowledgeable will respond.

Sent from my LGMP260 using Tapatalk

 

[torch]

The front wheel drive axle gets 80w, but the transmission shares a sump with the hydraulic system and should get tractor hydraulic fluid, such as Kubota UDT or equivalent.

For reference, mine has no problem or hesitation lifting a 420 lb snowblower. Plus the weight of whatever snow happens to be stuck to the sides, so 100lbs is a definite problem.

 

[Dwarner]

Should have UDT in it not 80w.

 

[D2Cat]

Was UDT around in 1985? I think 80W will do fine.

 

[SRG]

It's just a manual (standard) transmission, does it need to be anything special? Does it differ in some way from an automotive manual trans, aside from the hydraulic pump?

 

[torch]

Was UDT around in 1985? I think 80W will do fine.

I have a downloaded owner's manual of unspecified vintage. However the picture on the front shows a 4-bolt front rim.

It specifies using UDT in the transmission. That said, there is a final cryptic notation that reads: "Do not mix up the other nature of oi l other than aboves. When it is necessary to use SAE No. 80 gear oil by some reasons, you must drain oil off completely."

 

[Dwarner]

The older hydraulic systems I worked on used 10w or 20w motor oil. Guess that would translate to ISO 32 or ISO 46. Never used 80w in a hydraulic system but you learn something new everyday.

 

[silversink]

I drained the 80wt oil and cycled thru 5 gal of cheap hyd. oil - filled it with Kubota's hyd. oil and it all works good now. Thanks for the help, somewhere I read that it took 80wt, then some place else I read 10wt, I've heard motor oil-----glad I went with the UDT oil----now I know.

 

[Dwarner]

Glad to see the problem is resolved.