1999 Bobcat 753 auxiliary stopped working

[dynapl]

Hi,

I've been a Bobcat owner for quite some time without any issues until now. I'm currently experiencing difficulties with the auxiliary hydraulics, which had been working fine the last time I used them a couple of years ago. I just bought a snowplow and rototiller and nothing is happening.

I've searched this forum for answers but to no avail. Checked all fuses. My safety seat, bar, power traction etc. lights are on, the auxiliary light turns on. I can drive the Bobcat, and the lifting and tilting functions are working as expected. It seems there is pressure in the lines, as attaching the high-pressure hose to the coupler is challenging. I've attached pictures of my current situation for reference.

I'm unsure of the next steps to take. I haven't checked the solenoid valves directly yet (from my research, they should be located under the seat on the right-hand side). Can these valves be operated directly with 12V? Any guidance or advice would be greatly appreciated.

 

[laurencen]

all V plows I have seen and used require a signal thro the 7 pin I believe to divert the flow so either side can move, same my snowblower requires the hookup to rotate the discharge chute does this V plow have any sort of connector as well as the hydraulics?

what brand of plow is it?

 

[dynapl]

all V plows I have seen and used require a signal thro the 7 pin I believe to divert the flow so either side can move, same my snowblower requires the hookup to rotate the discharge chute does this V plow have any sort of connector as well as the hydraulics?

what brand of plow is it?

The plow is FCC by Paladin 120 series mnf. in 2018. The plow doesn't have any electrical connections besides the hydraulic hoses. I've also tried rototiller which doesn't have anything but hydraulics to rotate the blades and it also did not work. It seems that my issue is bobcat related. It's just with all good fuses and all indicator lights ON, I'm not sure what to check next.

When pressing the auxiliary button should I be hearing any hyd. engagement sounds like solenoid strike etc.?

 

[reaperman]

You could unhook one of the hydro lines from either attachment and turn on the aux just to see if the machine is pumping out fluid. Naturally you would put the open end in a bucket to catch the fluid if it's coming out.

 

[richmond802]

It may the switch. I am having the same issue with my 2000 753G with a grapple bucket I just purchased. You have to replace the whole handle on the right side there are not separate parts available

 

[Hulsey shit showX7]

It may the switch. I am having the same issue with my 2000 753G with a grapple bucket I just purchased. You have to replace the whole handle on the right side there are not separate parts available

Has there been any resolution to this issue.

 

[dynapl]

I know it's been over a year, but I wanted to provide an update for anyone experiencing a similar issue. I troubleshooted the handle switch, both the rocker and trigger, using MM to check for continuity. Both were good. Next, I removed the PWM module to inspect the wiring, and nothing stood out visually. I then traced the wires to the solenoids and disconnected both. With the Bobcat running and the auxiliary hydraulics in the ON position, I checked the DC voltage at each solenoid by pressing the rocker switch. The voltage went from 0 to 0.5V DC, which was far too low but indicated some activity. This pointed to the PWM module as the likely culprit.

The original module in my unit was a 6669529 REV C HECO 4097. I couldn't find an exact match, but the Bobcat website, based on my Bobcat's serial number, recommended a replacement: the Aux Control Module for Loaders, part number 6671669, described as "for loaders without the factory-installed front auxiliary hydraulics option." This was odd since my Bobcat appears to have factory-installed auxiliaries. Regardless, I purchased the module for $584, installed it today, and voila IT'S WORKING!