CASE 9020B

[Brendon Benton]

Hello all,
Just joined this forum because I bought my very first excavator. I'm sorry to ask so much but I need some major help!!! I didn't realize how bad of shape the wiring is in. Rats destroyed it. It started right up the first couple times but now it won't even turn over I swapped the battery relay because it wasnt sending power to the starter. Now I have power to the starter and nothing. Any ideas? Maybe a starter solenoid? Would anyone know where I could get my hands on a detailed wiring schematic for this machine? I'm trying to rewire the excavator because the rats destroyed it I'll post a couple pictures if I can.
Another problem is that the left track won't move with weight on it. Right track works perfect. I thought it was hydraulics because there was a blown hose but I changed it and still the same. Does any voltage control the tracks hydraulic? Maybe the rats chewed up the wire to the left track?

 

[Shimmy1]

Oh boy. Hope you got a smokin deal on it, looks like you're going to be busy.

 

[John C.]

I think a Link-Belt 2650 Quantum is the same machine.

I don't have the electrical schematics but you travel problem sounds like the swivel seals are gone.

 

[Brendon Benton]

Oh boy. Hope you got a smokin deal on it, looks like you're going to be busy.[/QUOT
Well it was 15 grand. Don't know of that's a good deal. I'm new to excavators. It has 7k miles.

 

[Brendon Benton]

I think a Link-Belt 2650 Quantum is the same machine.

I don't have the electrical schematics but you travel problem sounds like the swivel seals are gone.

Damn that's not good. Would it only cause one side to not work? Where is the best place to get a seal kit?

 

[Shimmy1]

Did you know the wiring was fubar when you bought it?

 

[Brendon Benton]

Did you know the wiring was fubar when you bought it?

No I didn't check behind the seat. I should have but it's to late now.

 

[Welder Dave]

7000 miles? LoL

 

[uffex]

 

[uffex]

Good day
Please see attached hope it helps you
Kind regards
Uffex

 

[Brendon Benton]

7000 miles? LoL

Lol yeah I screwed that one up. Is 7000 hours decent?

 

[Brendon Benton]

Good day
Please see attached hope it helps you
Kind regards
Uffex

Thank you sir I will definitely use this!

 

[Vetech63]

For every chewed wire you can physically see there will be another you cant see. Remove every panel you can and inspect every harness. From the amount of rat $hit in those pics, they have lived there a lonnnnnng time

 

[Coy Lancaster]

Man what a mess, I've been in situations like that when I worked on these machines, rats and mice love the wire coating sense they're made of soybeans. Your track problem could be a swivel seal blown, the best way to check is with a pressure gauge and something to block track movement.

 

[Brendon Benton]

Man what a mess, I've been in situations like that when I worked on these machines, rats and mice love the wire coating sense they're made of soybeans. Your track problem could be a swivel seal blown, the best way to check is with a pressure gauge and something to block track movement.

Wow I didn't know that. Makes since though. Would that cause only one track not to work? But I'll start with that thanks man!!

 

[Coy Lancaster]

Wow I didn't know that. Makes since though. Would that cause only one track not to work? But I'll start with that thanks man!!

It could very well be the problem. But you need to check pressures by capping the final drive lines at the track drive and see what happens.

 

[John C.]

Since the circuit reliefs are in the final drive motors you really don't want to cap the lines and try it. The only relief you will see will be the main relief.

 

[Shimmy1]

Since the circuit reliefs are in the final drive motors you really don't want to cap the lines and try it. The only relief you will see will be the main relief.

But you will know for certain where to start looking for the drive problem, no?

 

[John C.]

Actually, that won't tell you anything about flow or the drive problem. The pumps will make up more than enough flow to hide a leaking swivel seal and if this unit doesn't have the travel circuit covered by a main relief you will blow something up. The B machines were basic negative control open center systems.

 

[Brendon Benton]

So what do I need to do then to test the swivel motor? Have some good news though. I got almost everything electrical working. Only thing is that the control on the left side console won't unlock. They are always locked so I can't move anything. Would anyone happen to have pictures of the left hand harness or schematics on it?? There are more wires coming from the console itself than there are on the wiring harness.