No Hydraulics in the winter

[Pecord Exc]

Last year we purchased one of the mini bobcats with a snowblower for snow removal, very handy for sidewalks. In the winter though it start and the motor runs great we get no hydraulics whatso ever the pump just whines. We parked it with the anticipation of goin over everything during the day. We waited for warmer tempatures about 50 degrees and she ran great we thought it was a fluke but the next snowstorm we had the same problem, changed all hydraulic fluid and filters same problem. We parked it anticipating looking at it another day and never got around to it. It has been running great all summer around the shop but I know this winter the machine will be giving us the same problem. Any ideas on what is going on or what to look at?

 

[Pecord Exc]

It's a bobcat 463 with a diesel kubota in it.

 

[smokey1]

You could have water in the chain case or hydraulic tank . Change the fluids,would be a stsrt.

 

[Pecord Exc]

We did a full service and changed all fluids and filters. I am truly puzzled with this one, and I know it will turn out to be something stupid.

 

[cps]

what grade of hyd fluid are you using, also how cold are you talking about over there?

 

[Pecord Exc]

the same hydro i have in all my other equipment, and not that cold maybe worst is 15 degrees F

 

[CM1995]

Just a question but what weight hyd oil are you running? Bobcats are finicky with the weight of the hyd oil you run in them. Down south we have to run 30W hyd oil, any other weight and the hydraulics are sluggish or won't operate at all.

 

[Pecord Exc]

Shell aw 32

 

[willie59]

Try Shell Tellus 22.

 

[paulsoccodato]

Aw 32 might be too thick for that, especially in the winter. Bobcat hydrostatic oil is pretty thin, you might want to try it

 

[cps]

Try Shell Tellus 22.

I Agree try it and see!

 

[cps]

Try Shell Tellus 22.

I Agree try it and see!

 

[250c]

I know you changed the hyd oil and filter but this sounds like you still have some water in the system. When the frozen water cyrstals get to the filter it stops all fluid flow, once it melts everything works normally.

 

[Pecord Exc]

FYI it was a few o-rings on the pump! ill get a pic soon!