• Thank you for visiting HeavyEquipmentForums.com! Our objective is to provide industry professionals a place to gather to exchange questions, answers and ideas. We welcome you to register using the "Register" icon at the top of the page. We'd appreciate any help you can offer in spreading the word of our new site. The more members that join, the bigger resource for all to enjoy. Thank you!

Deere 892e tracking problem

Mike L

Senior Member
Joined
Dec 1, 2010
Messages
1,901
Location
Texas
Occupation
Self employed field mechanic
I got a call to go look at this machine tomorrow. Apparently Deere has been there and 2 other independents and no one has cured it so now it’s my turn. Intermittent tracking to one side and sometimes if you add a tiny bit of pressure of bucket curl it will straighten out but not always. Owner says it started doing this after the pumps were replaced. My first thought is to start checking pressures at the pumps and move forward from there and the owner thinks it’s a sensor or an electrical issue. I am not at all familiar with this machine and was wondering if anyone has any experience with a similar situation?
 

John C.

Senior Member
Joined
Jun 11, 2007
Messages
12,865
Location
Northwest
Occupation
Machinery & Equipment Appraiser
My question to the owner would be if the pumps were new or rebuilt exchange and were they factory or aftermarket? I think the gauges would be appropriate but if it is an adjustment problem on the pump, you will need a flow meter. I know those have Hitachi electronics on them but don't know for sure whether or not the Dr. ZX will work to check them.
 

Mike L

Senior Member
Joined
Dec 1, 2010
Messages
1,901
Location
Texas
Occupation
Self employed field mechanic
I’m not sure why the dealer couldn’t figure it out. I don’t have a flow meter or dr. Zx. As far as adding a bit of bucket curl to even out the speed I figure it’s just slowing down the faster pump and making it track straight. I assume this is just like most excavators meaning that each pump handles drive speed on one side and they divide the rest of the hydraulics between them.
 

John C.

Senior Member
Joined
Jun 11, 2007
Messages
12,865
Location
Northwest
Occupation
Machinery & Equipment Appraiser
I believe the machine joins both pumps when another function is used to keep the machine traveling straight.
 

GregsHD

Senior Member
Joined
Sep 26, 2014
Messages
557
Location
Mahood Falls, BC
Occupation
Self Employed HD Mechanic
Yes they have a flow combiner valve in the MCV to keep it tracking straight when using a digging function at the same time.

My question is, why were the pumps replaced? Catastrophic failure?
 

Mike L

Senior Member
Joined
Dec 1, 2010
Messages
1,901
Location
Texas
Occupation
Self employed field mechanic
I don’t know why the pumps were replaced. I talked to the service manager at Deere and he knew all about this machine and thought that they had cured it a year ago. I guess I’ll find out the whole story in a couple of hours. The intermittent part is what gets me. Owner says it will act up for weeks and then go away for a few days and then return. In my mind that doesn’t really go along with pressures being out of adjustment.
 

Mike L

Senior Member
Joined
Dec 1, 2010
Messages
1,901
Location
Texas
Occupation
Self employed field mechanic
So I went and checked it out this morning. The pumps were replaced because the input seals were leaking. They are reman pumps and we’re in it when the current owner bought it. I repaired plenty of wiring that had been twisted together and covered with electrical tape. For the life of me I couldn’t find a fitting to put in the pump the check pressure on my truck . The left side track runs slow but if I curl the bucket in or hold a little press down on the main boom the track speed will pick up. I did some more looking and found the propel pilot pressure switch had a wire that was only held together with a couple strands. Going to pick up the switch and a pressure fitting tomorrow and see what happens.
 

jonno634

Well-Known Member
Joined
Dec 19, 2018
Messages
141
Location
Garfield, WA
Occupation
Farmer
I had a more severe issue with tracking with my 892E and it was that the pump was starting to go bad (the end cap had a rough spot that would sometimes stick). Once you got the pump spooled up, it all worked ok... but as soon as the pump de-stroked you had to bump a function to get the pump to stroke.
 

Mike L

Senior Member
Joined
Dec 1, 2010
Messages
1,901
Location
Texas
Occupation
Self employed field mechanic
I’m at the machine right now and I’ve got all kinds of issues. The wiring harness is such a mess I’ve disturbed something and now the throttle has a mind of its own. Sometimes it idles right up on its own, sometimes it hunts, and right now it won’t idle up at all. As far as the tracking issue, it’s tracks to one side until I hold in on bucket curl and then it tracks straight. I’m thinking that when I travel it’s not getting a pilot signal but when I curl the bucket it strokes up the other pump and straightens out. I think it’s all in the harness but I’m still digging
 

jonno634

Well-Known Member
Joined
Dec 19, 2018
Messages
141
Location
Garfield, WA
Occupation
Farmer
If you unhooked the battery or disconnected a particular fuse, then you need to re-cal the throttle.
 

Mike L

Senior Member
Joined
Dec 1, 2010
Messages
1,901
Location
Texas
Occupation
Self employed field mechanic
Yup. I have the procedure. The owner bought another machine so he’s going to haul his back to his shop and I’ll get back on it in when I get back from vacation.
 
Top