Columbo
Senior Member
So, today was maintenance day on the hydraulic system, thanks again for the help with the return filter!
For reference I last sampled the hydraulic oil at 5980 hrs, machine now has 6040 hrs. The results from that sample were good (posted in this thread- https://www.heavyequipmentforums.com/threads/hydraulic-oil-change-interval.108435/#post-1222603)
All was going well after I got the new filter installed, I had stored the machine for the winter with the boom/stick extended to retract the cylinders. I cycled each function slowly as I had also changed the pilot filter. I then stopped in the hydraulic level check position (level within the normal range). When I was done I parked the machine with the stick extended again; I happened to open the hydraulic compartment again and now I see the start of milky oil in the sight gauge…. Aw, ****!!
I had noticed that the hydraulic oil fill plug was a few turns loose, I can only assume I forgot to tighten it at the end of last season. Otherwise, there are no other known leaks. So, where do I go from here? Drain and keep flushing the system with new oil? Filter cart? Cat 311B, s/n 8GR00401.
Stuck hydraulic return filter
I’m servicing the hydraulic return filter on a Cat 311B, S/N 8GR00401. I don’t know when the last time this filter was serviced. Following the service instructions I have released any pressure in the tank, removed the filter cover and released the pressure in the filter canister. Next you’re...
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For reference I last sampled the hydraulic oil at 5980 hrs, machine now has 6040 hrs. The results from that sample were good (posted in this thread- https://www.heavyequipmentforums.com/threads/hydraulic-oil-change-interval.108435/#post-1222603)
All was going well after I got the new filter installed, I had stored the machine for the winter with the boom/stick extended to retract the cylinders. I cycled each function slowly as I had also changed the pilot filter. I then stopped in the hydraulic level check position (level within the normal range). When I was done I parked the machine with the stick extended again; I happened to open the hydraulic compartment again and now I see the start of milky oil in the sight gauge…. Aw, ****!!
I had noticed that the hydraulic oil fill plug was a few turns loose, I can only assume I forgot to tighten it at the end of last season. Otherwise, there are no other known leaks. So, where do I go from here? Drain and keep flushing the system with new oil? Filter cart? Cat 311B, s/n 8GR00401.