left track slower than right cx36B

dennis e suffriti · Jun 24, 2021

I have a case 2007 cx36b , got it about a month now, the left track is slower than right, took pressure readings from test ports on drive motors , both sides were pretty much the same, low speed 500psi free wheeling, high speed 1000 psi free wheeling, dead head pressures with track pinned was 1100 psi low speed and 3100 psi in high speed . the pilot travel valve has full movement , got to pull case drain line and check flow and amount hyd oil next. and if I have to',cross hyd lines from left to right side and see if that follows to right. If so the left final drive or motor is going. Any help would be great, really scathing my head, I don't want to start throwing big money unless I really know what's wrong. Thanks Dennis

corey1980 · Jun 26, 2021

I hope someone replies to your post. I have the same year and model with the same exact problem.

uffex · Jun 26, 2021

Good day Guys
Suggest you check out for mechanical faults it may be for example a failed idler bearing or transmission issue, you can get the complete troubleshooting information at excatech.org > Library > Common defects > weak crawlers download or read it may well help. We are around if you need more help.
Kind regards
Uffex

dennis e suffriti · Jun 26, 2021

corey1980 said:
I hope someone replies to your post. I have the same year and model with the same exact problem.

Corey have you had that machine for some time, if so did the problem develop slowly, and have to done any trouble searches, I will kept you up to date when I fix this. I bought this machine about a month ago knowing the track problem , got it from a dealer

John C. · Jun 27, 2021

Hydraulic pressures for dead heading the tracks should be the same in both high and low speed.

dennis e suffriti · Jun 27, 2021

John C. said:
Hydraulic pressures for dead heading the tracks should be the same in both high and low speed.

John, I thought that the pressures is what makes the high and low speeds different, when I freewheeled the tracks there was a pressure different in high and low travel speeds of 500psi these mini excavators have several different pressure systems . Thanks

John C. · Jun 27, 2021

Two speed is usually achieved by changing the angle of the swash plate in the motor. The flow to the motor is the same in both speeds. The pressure reliefs are the same. High speed shifts the swash plate to half stroke which increases the rpm. You should have four hoses going to each motor.

dennis e suffriti · Jun 27, 2021

John C. said:
Two speed is usually achieved by changing the angle of the swash plate in the motor. The flow to the motor is the same in both speeds. The pressure reliefs are the same. High speed shifts the swash plate to half stroke which increases the rpm. You should have four hoses going to each motor.

Yes 4 hoses foreword, backwards, speed changer and case over pressure hose. When I tested pressure I used the testing ports that are pugged on the drive motor, I did not test from the foreword or backwards hoses, should I test directly at hose ends, if I test from hoses it will be a deadhead pressure only unless I install a tee , but that would be the same as the test ports ???. Going to test case over pressure amount of oil . Do you have any suggestions I check track slack, the machine has a newer track on the left side , same side the problem is , came like that. Thank you for the information . Dennis

John C. · Jun 27, 2021

You test pressure at the pump. There is no over pressure hose, it is called a case drain. The travel motor reliefs drain into the down stream hoses feeding the travel motors. You check the case drains by removing the hose at the motor, locking up the track and then running the motor over relief. A good motor will have less than a pint of oil in a minute of stalling. Case drain is the oil that is leaking inside the motor from the supply to make it turn.

A difference in the length of the tracks can cause the machine to veer off to the shorter track side. FYI: Below is an educational video about excavator undercarriage.

muddauber · Jun 27, 2021

I have a CX36b and had a CX50b, both tracked slower on one side after about 2000 hours. Both were open cab machines, both had corrosion and wear in the pedal linkage where the pedal rocks forward/reverse to work the travel. There is a little rounded surface on the underside of of a metal block at the bottom of the travel lever/pedal assembly where it goes through the floorboard, mine were rusted and had a flat spot worn that prevented full stroke, but to different levels on one pedal than the other, so faster travel on one side. Worth taking a look.

gggraham · Jun 28, 2021

These machine were notorious for bad travel pedals, I've seen one with a bad swivel the rest were pedal related. Raise the window , don't start the machine. Clear away any dirt and remove the floor matt if it has one. Now using your finger press on the right then the left pedal forward and back. If one seems to have spring tension and the other side does not it's in the valve itself. The repair kit is more money than a new travel valve.

dennis e suffriti · Jun 28, 2021

gggraham said:
These machine were notorious for bad travel pedals, I've seen one with a bad swivel the rest were pedal related. Raise the window , don't start the machine. Clear away any dirt and remove the floor matt if it has one. Now using your finger press on the right then the left pedal forward and back. If one seems to have spring tension and the other side does not it's in the valve itself. The repair kit is more money than a new travel valve.

I have a open canopy, all ready cleaned pedals and replaced the boots. I did your finger test and the right side lever [ which is the good side] moved freely, but the left side [ the problem side ] was different, like it didn't fully go back to neutral. some thing to look in to. Thanks for the info. The old boots were ripped , like muddauber said might be corrosion on pilot valve spools thanks guys will let you know on results .

corey1980 · Jun 28, 2021

dennis e suffriti said:
Corey have you had that machine for some time, if so did the problem develop slowly, and have to done any trouble searches, I will kept you up to date when I fix this. I bought this machine about a month ago knowing the track problem , got it from a dealer

I'm in the same boat. I just bought it two weeks ago knowing of the track problem.

kith · Jun 29, 2021

Check under the pedals for anything that could limit their travel.

gggraham · Jun 29, 2021

The left side that doesn't neutral is an internal problem with the springs and spools, it's new travel valve time. Parts are hard to get or impossible and the price is ridiculous.

dennis e suffriti · Jun 29, 2021

gggraham said:
The left side that doesn't neutral is an internal problem with the springs and spools, it's new travel valve time. Parts are hard to get or impossible and the price is ridiculous.

Going to get in to it next week, a rebuild kit from case is $385.00 and trying to find a pilot valve in the USA, is imposable, you can get one from over sea's , never bought from over there, a rebuild kit will work as long as there is no corrosion ,

dennis e suffriti · Jun 29, 2021

corey1980 said:
I'm in the same boat. I just bought it two weeks ago knowing of the track problem.

How many hours on you case corey, I have had three 580's in the past and never had any big problems with them, I really like case equipment, that's why I bought this cx36b knowing the track is issue , I have 3300 hours

corey1980 · Jun 29, 2021

dennis e suffriti said:
How many hours on you case corey, I have had three 580's in the past and never had any big problems with them, I really like case equipment, that's why I bought this cx36b knowing the track is issue , I have 3300 hours

I got just a little over 1200 hours on the cx36b. I really like Case Equipment too. Got 2 580k's. 1 580sm series 3, 9010b excavator, and a 1150e long track dozer. The backhoe's have been trouble free for me.

gggraham · Jun 30, 2021

dennis e suffriti said:
Going to get in to it next week, a rebuild kit from case is $385.00 and trying to find a pilot valve in the USA, is imposable, you can get one from over sea's , never bought from over there, a rebuild kit will work as long as there is no corrosion ,

Case must have gotten better on their pricing the kit use to be 3/4 of the cost of a whole travel valve.

dennis e suffriti · Jun 30, 2021

gggraham said:
Case must have gotten better on their pricing the kit use to be 3/4 of the cost of a whole travel valve.

IF the valve is corrosion free I will rebuild but if damaged will have to find one, have you or any one flowing this post ever bought parts from over seas. pro and con's please Thanks

left track slower than right cx36B

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