Bobcat B300 Shifting problems

Hey my uncle has a Bobcat B300 that ill be taking to my Diesel class to work on next week and i'm hoping to get some advice on what it might be before we start. It starts up fine. when we try to shift it into FWD or REV it wont budge. It has a hydro-stat. transmission. I am thinking maybe the shift handle might have loosened or something. or is it the hydro-stat. drive motor? im an novice mechanic and would certainly appreciate any advice on what it might be.

I have the same backhoe that is giving me the same problems right now. I'll let you know what I find out.

ok i start work on it tuesday if i find out before you post ill let you know

capt_met said:

I have the same backhoe that is giving me the same problems right now. I'll let you know what I find out.

Click to expand...

its yours im talking about uncle metin

check that you have power to the switch, It controls the pilot pressure on which way to stroke the pump

never mind, lmao

so far we have found many problems with the B300, However we have not located the short in the shuttle shift lever. the switch is showing continuity at the harness.but when started and switched to reverse it blew fuse #1. so we have a short to ground somewhere between the dash and the solenoids. tomorrow we should break into it and try to find it. we have also discovered the exhaust manifold is disconnected from the muffler.when transporting from home to shop it was found to be hemorrhaging coolant. before shutdown antifreeze wasn't topped off.most of the coolant lines are frozen solid. also it has a good bit of pressure coming from the puke tube on the head and has been blowing oil everywhere. we also found a pretty good hydraulic leak. so our day thus far was productive in finding most of the faults.once we finish rebuilding our 6.7 cummins we will bring it in the shop and pull the engine and start making this beauty run like she should

well today i didn't get too far on tracking down the source of our short. The problem is the backhoe will not move forward or backwards. the electrical issues we are having are : When we put the shuttle shift in REV. it blows fuse#1. It has 2 extra wires from the shift wiring harness that used to be for a speed selector switch. Those wires are just cut. There is no speed selector on the shift lever anymore. I traced the wiring from the shift lever to the directional control valves on the hydro-static pump.(we will soon be pulling the weather proof covering to look for shorts in the wires themselves) testing the directional control valves for continuity tomorrow. i traced fuse #1 to relay #2 and relay #5. all show continuity. I haven't yet checked the black wire from fuse 1 that goes to the ignition switch. What is really confusing me is why it would blow fuse 1 when put in REV. Give me some input on what you all might think it could be

today we went through and found the short. it is in the wiring harness for the shuttle shift. We thought it was relay # 5 because of blackening on the prongs. We also found ground on all the connecting wires from reverse position. Once we clipped the shorted wire to the horn it quit blowing fuse #1 when put into reverse, however still would not move when shifted in forward or reverse.so we went looking more into the hydrostatic rather than electrical.When we looked to see if the fluid was low we found it looked like a vanilla milkshake and smelled like diesel fuel. also when we drained the tank water came out first. so we are thinking that if it is diluted with water or fuel it could be preventing the pump from building pressure. we will see once we get fluid and a filter back in it.

today we got it moving. the problem was the diode on the reverse solenoid was bad. causing current to flow in the wrong direction.after searching though about all the wiring the problem was a 14 cent diode... but it is solved.. we moved it forward. and since tonight we finished the 6.7 cummins we were building we can fit the ol' cat in the shop. our next project will be swapping the engine. i will post pics. possibly on a new thread:drinkup

I know this is a long shot, but hoping this stirs up some dust. I just bought a Ingersoll Rand BL-370 off ebay, which I believe is identical to the Bobcat B300. The seller is a scumbag and did not disclose a bunch of issues, and one i'm trying to fix right now is high speed. There is no stalk in the column like owners manual shows, appears they rewired the turn signal switch to be forward and reverse, but no way to engage the other speed range. Seems like is in low right now based on ground speed. Anyone provide any assistance for wire colors and what I'd need to do to them? i need to disassemble the dash, I'm hoping the wiring is stuffed down there, but not sure if it will even work if it is...

Good, I'm new here and own a Bobcat b100, did you manage to resolve the issue with backward?