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ASV RC100 will start but not function.

Hardline

Senior Member
Joined
Nov 29, 2009
Messages
340
Location
Waxahachie Texas
Occupation
Small business owner
Machine was parked 3 days ago working fine.

Machine will start and run but has no hydraulic function bucket or drive functions. Fluid level is good. Checked all fuses and relays. Installed a pressure gauge on the test port on the hydraulic filter manifold and recorded 518PSI so I know we are moving oil while running. Ruling out coupler or pump shaft failure.

When you start the machine and lower the seat bar and close the door I get the yellow 1st speed light. I can switch it into 2sp and get the green light. As I open the door or raise the seat bar the light will go out. Not sure if the seat switch should do the same thing or not but it does not. I can not gain access to the seat switch or the wiring. The arms are down and can not raise thew cab.

Any insight on how this system works would be great as I am not familiar with this machine. Owner is going to have me install new fluid and filters on machine but I think this will not affect the current lack of operation.

Thanks JJ
 

74inchShovel

Well-Known Member
Joined
Jan 19, 2008
Messages
164
Location
Washington
My thoughts are that there is no pilot pressure. This can be caused by ( among other things) a seat switch, bar or door switch. Check this first before you change filters & fluid. The fact the light goes out when you move the last two makes me think that these are ok. On my machines there is a noticeable difference in the feel of the controller when the lap bar is raised, they become a little looser. Its subtle, but its there. This looseness is due to no pilot pressure at controller. Both motion and bucket rely on this pressure, and since you lost both at the same time... I "think" the 3 switches are in series, and go to ground. When one is open, it cuts out the pilot solenoid, then nothing happens on machine. Seat switch is in seat, are you sure you can't remove seat without raising the cab? First thing I would do is slam my ass down hard on the seat, try to get the switch behavin'. Best if no one watches this, lol. Good luck
 

Ron Burgundy

Banned
Joined
Apr 23, 2013
Messages
41
Location
NorCal
My machine's sitting idle for the same reason. Thanks a lot manufacturers for making our machines so safe that they don't work.
 

Hardline

Senior Member
Joined
Nov 29, 2009
Messages
340
Location
Waxahachie Texas
Occupation
Small business owner
Okay I figured out the machine.

Mice had ate the wiring from the bottom of the fuse block to the Pilot Generation Solenoid valve. Wow what a ordeal that turned out to be to get to. I must now admit I am much more familiar with this machine and how it works now. Now have a service and parts manual in addition to a wiring schematic.
 
Last edited:

Hmb

New Member
Joined
Aug 21, 2018
Messages
1
Location
Vermont
Hardline
I’m having a problem with both the seat switch and the lap bar switch. Have replacement parts but need wiring diagrams. Would you mind sharing the one you have?
Also, mechanic manually lifted bucket and left up to access seat with another digger. Will this cause an issue with hydrolics when we get it back up and running. No option to manually lower it at this point. Thanks.
 

Cris Rhea

New Member
Joined
Feb 6, 2023
Messages
1
Location
Rochester, MN
I know this is an old thread, but I had a similar failure on my RC60. Like most suggested, I spent a ton of time tracing out the wiring to ensure seat, lap, and door switches were good (and no mouse-chewed wiring). Turns out there are a pair of valves the safety switches control to allow pilot pressure for movement and arm. In my case, the valves had gotten stuck and the solenoids were bad (blowing fuse). Took me forever to find... on an RC60, they are under your feet and below the fuel tank. Accessed by removing belly pan and crawling under machine. Knowing what I know now, I could have fixed this is a couple hours (not the couple weeks it took me to tear everything apart looking for the problem). Hope this helps someone down the road....
 

golfmechanic

New Member
Joined
Feb 23, 2024
Messages
4
Location
osterville, MA
I know this is an old thread, but I had a similar failure on my RC60. Like most suggested, I spent a ton of time tracing out the wiring to ensure seat, lap, and door switches were good (and no mouse-chewed wiring). Turns out there are a pair of valves the safety switches control to allow pilot pressure for movement and arm. In my case, the valves had gotten stuck and the solenoids were bad (blowing fuse). Took me forever to find... on an RC60, they are under your feet and below the fuel tank. Accessed by removing belly pan and crawling under machine. Knowing what I know now, I could have fixed this is a couple hours (not the couple weeks it took me to tear everything apart looking for the problem). Hope this helps someone down the road....
this literally happened to me yesterday , machine died while scraping snow at an extreme angle so everything stopped with front end up in air with weight on bucket. nice. jumped out seat, door and lap bar switch, still nothing , checked all fuses and swapping relays, nothing. and i can't find a print for my rc60. so hopefully i can locate these valves and check them. but mine isn't blowing fuses. if you have any info on this, like prints or how to get them, i would greatly appreciate it.
 
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