I read somewhere in the many pages here that you can sand vanes to help with a weak bobcat. My 632 runs strong for about 15 min. then howls and refuses to turn. I have changed every filter including the famous bronze suction. The pump is the only thing I can think of that might be left. This Cat has scratched and bit me (caught fire, sunk on a job and sprayed gas and hydr. oil like a skunk) but I have a very complex love/hate thing with it. I will see it work if it kills one or both of us. So, any help will be welcomed.
Flatten vanes?
- Thread starter rhc123
- Start date
Its not actually the vanes that you sand, its the rotating groups and wear plates. These are the main components for the hydrostatic pumps. The rotating group is the working part of the piston pump. When these areas get worn, oil by-passes. The problem still sounds like the filter, its exactly how mine acted before i cleaned the filter. Have you tried running it without the filter as a test?
I skipped cleaning the filter and went with a new one. There was also a reference to charge pressure. Can this be part of the problem? If so, how do you check/adjust this? Thanks for your time and know how.
skidsteer.ca
Well-known member
- Joined
- Jan 20, 2006
- Messages
- 3,853
If it runs ok cold the oil must be going through the filter ok. I'd find you charge pressure port and monitor it while it warms up. Likely this model used the hydraulic pump to create charge pressure, so if the hydraulics work good, then then only the charge pressure relief should be responsible if the pressure is low.
If the pressure stays up until you drive it, then likely it is in the wear plates.
Ken
If you remove the pressure sender, it will be screwed into the port block. Install a pressure gauge, drive it around to warm it up and check the pressure. It should be 90-120 psi or along those lines.
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Ok. I have gotten the thing re-wired and running again. The pressure is 100-120 warm at mid idle but drops to 60-70 when I move it. The bucket and lift arms still work fine though. If this was a 72 chevy I could fix it with a 1/2 ,9/16 and flat head screw driver. Thanks for you help.
That charge pressure reading is just fine. A lot better than what others have had in the past. Moving they had it drop to almost zero!
Have you located the lack of power issue?
I have no idea why it goes to howling and refuses to turn after it get warm. I guess the pump is going out in it. I can fix the motor but I do not know squat about hydraulics. Thanks
The hydraulics are just new to you is all, they are very simple. If you can work on the engine (and not have it blow up) you can work on the hydraulic system too. Just keep everything clean when working on them. The good thing is the parts for the pumps are available cheaply aftermarket. You can re-condition your entire pump for under $1,000,
I have found several places on the web in China that list parts for the TA1919 but nothing in USA other than dealer. I will burn it before I pay Bobcat dealer prices. Do you have a good source?
Look up my profile and send me an email. I'll look up the details when i get home who to contact. I can't remember off hand, but they were REALLY cheap.
