03-02-2012 08:49 PM
Hi, today I was clearing snow and suddenly I lost my hydraulics. The machine came to a dead hault. No lifting controls, and no travel. There were no warning lights, no strange noises, no fluid leaks. I checked my fuses, and oil levels but everything looks good. While the machine was running I looked to see if the hydraulic fan was turning, but it wasn't. Does this mean my hydraulic pump is shot? Or could it be a relay or something simple? (I really hope) Checking the internet, I think it might be the pump drive? I seen that my engine might need to be pulled to fix it, is this true, and I was just wondering if anyone knows how expensive this might be to have repaired?
Any help or trouble shooting suggestions would be greatly appreciated.
03-03-2012 02:46 AM
Keep researching on the internet. You need to find out if the problem is electrical or hydraulic. Typically hydraulic pumps fail gradually. Has the filter been serviced recently? You can also make a close visual inspection to find a loose connection/broken wire type problem. An investment in good legible schematics and/or service manuals is a good idea if you're planning on keeping it. Try to understand what you're looking at before performing any repairs or disassembly. Do you have a CAT dealer nearby? Good luck. Please post fix.
03-05-2012 01:21 AM
Thanks for the reply. I do have a Cat shop near by but they are swamped and nobody is willing to talk to me over the phone to help me trouble shoot. They are booking two weeks in advance and I need this machine ASAP. I have no idea what to do? This is a nightmare.
03-05-2012 03:29 AM
Keep researching on the internet. Do the controls have a mechanical linkage? Or a joystick with electrical connections? If linkage, check for correct movement. If joystick, check wiring continuity and plug connection. Do any controls work? When it quit working did it suddenly quit, or taper off? When you checked fuses, did you ohm them out, or just do a visual? I've been burned by that one before. If there are electrical connections on the spool ends on the control valve, make sure they have correct voltage and ground when activated (not running, key switch on, control activated). May I assume you've checked the fluid level and have good filters in place?
03-11-2012 01:29 AM
Turns out it was the drive coupler. I had to pull the engine to get at it, but it actually wasn't as bad as I thought it would be. I got it out in 4 1/2 hours, the parts and fluids cost about $500, then 5 hours to get it back together. The steel gear had some chips in the teeth, so I think the last owner must have had the same issue, but replaced just the nylon coupler, because the chips looked old. Now everything is new and good to go. The worst part was lining up the pump to the engine, then putting the two mounting bolts back in. These machines are very compact, and hard to work on for a 6'3, 250 pound dude :D
Thanks for the replies, and I hope this thread can help someone troubleshoot in the future.