Recent content by hmw

thanks for the reply. This machine has no original hoses. I re-hosed it completely this past spring for the customer i ended up buying it from. After i bought it, with a blown up engine I put a kit [seals, wear plate] in the pump. One o-ring was damaged but the gears and housing looked good...

RO stands for "Rust and Oxidation inhibitors" AW stands for "anti-wear" The number is the viscosity rating usually at at 40degrees C. We use AW in all our bucket trucks and derricks. We have used RO in a pinch. I would use Bobcat fluids if machine was still under warranty. Of course if its still...

Well, I replaced the hydraulic oil with 10W30 and it hasn't seemed to make much difference. I kinda did't think it would but I would rather have the right oil anyway. Next I'm going to hook up my flow meter/pressure gauge in between the pump and valve bank and see what happens. I'll post what i...

Thanks for the replies. I've got a line truck to work on right now so maybe I'll get back to the Bobcat this weekend. I didn't say much about it but its a nice machine. I bought it with a hole in the side of the block. [threw a rod]. Had a horizontly opposed Kohler and I replaced it with a "v"...

I'm going to change it to 10w30. Other Pieces of equipment i've worked on use 20w50 synthetic motor oil in the hydro units so 10w30 sounds right. Yes the hydrostatic drive works fine. No noise and not jumpy. It does not have a suction filter only a return one. I Re-hosed this machine earlier...

Recently bought a 93' 440B. My problem is the lift arms are jumpy, like the pump is cavitating or getting air and it foams the hyd oil. Even after cycling many times. This machine has had a history of this. The previous owner bought it in 99' and said it did it since he had owned it, he just put...

Hi, new to this forum. Recently bought a 440b with the same symptoms you mentioned. I recently "re-hosed " this machine for a customer. About 3 months later the engine blew up and I bought it from the customer. I am a hydraulic and equip technician for a local electric utility co and i work on...