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Curtis B.
Curtis B., Technician
Category: Construction and Road Equipment
Satisfied Customers: 1022
Experience:  Technican turned service manager with multiple lines of equipment and rental units.
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I have a cat D3c. Left track not pulling. Checked linkage

Customer Question

I have a cat D3c. Left track not pulling. Checked linkage and fluid all ok
Submitted: 7 months ago.
Category: Construction and Road Equipment
Expert:  catmastertech replied 7 months ago.

Hello,

How did this problem begin?

Do you hear any noises from the final drive?

Did you drain the oil from the final drive to inspect it for metal?

What is the full tractor serial number?

Customer: replied 7 months ago.
No noise detected left track just stopped pulling I have it off the ground. Right track pulls left doesn't
Expert:  catmastertech replied 7 months ago.

What is the full machine serial number?

Customer: replied 7 months ago.
8be00180 arr# *****
Expert:  catmastertech replied 7 months ago.

How did this problem begin? What were you doing last?

Customer: replied 7 months ago.
Customer was pushing dirt for stock pile
Expert:  catmastertech replied 7 months ago.

Does the track move or turn at all?

Customer: replied 7 months ago.
No
Expert:  catmastertech replied 7 months ago.

I would drain the oil for the left final drive to inspect it for metal or damaged parts.

Possible the upper bearing has failed and has jammed in the final drive gears.

Expert:  catmastertech replied 7 months ago.

Do the brake pedals feel even and move equally?

Customer: replied 7 months ago.
It has levers they both feel the same
Customer: replied 7 months ago.
It's not lickage I checked that. I checked to make sure plungers were moving in and out on valves. All looks good
Expert:  catmastertech replied 7 months ago.

This tractor does not have steering brake pedals? Is it a SA (Special Application -for farming- usually with manual transmission)?

Customer: replied 7 months ago.
manual trans
Expert:  catmastertech replied 7 months ago.

Just want to verify the brake bands are not damaged. Usually the pedals will feel different when a brake band is damaged. Hand controls will not feel the brakes the same as pedals. If the oil in the final drive is clean, then I would suspect a brake band.

Customer: replied 7 months ago.
But left track not driving at all it won't turn right. When moving forward you pull left it goes left you pull right it stops
Expert:  catmastertech replied 7 months ago.

You said earlier, the left track does not move. I assume you meant it is locked completely.

Expert:  catmastertech replied 7 months ago.

Dou you mean it does not have any pulling power? Does it turn with the machine off the ground?

Customer: replied 7 months ago.
Unit in the air track doesn't move. On ground it mves but won't turn right
Expert:  catmastertech replied 7 months ago.

Ok, sorry for my misunderstanding.

The only things that can cause this is the pressure is going to the release piston or it is jammed in the release position.

Can you move the left track manually and it not move move the right track?

Expert:  catmastertech replied 7 months ago.

This would tell you if the drive is broken to the left track.

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