Komatsu D20A-6 ?

MasterG

New member
Joined
Jul 6, 2019
Messages
1
Tractor
D20a-6
Im new to the forum. I have enjoyed so much of this thread. Very educational for me. Dont want to offend anyone and hope no one takes it the wrong way I’m only seeking some help. I’m not allowed to post yet as I am new to forum so I’ll get to the point. I’m the proud owner of a d20a-6. My tilt cylinder is leaking pretty bad and Two lift cylinders aren’t looking to great either. So I have decided to repack all five cylinders and I am hoping for advice and if anyone has a part number or cross reference for these cylinders. I’ve called around some hydraulic repair shops and it’s pretty expensive at 75 per hour with an average of hour and a half per cylinder barring any trouble. Not saying it isn’t worth it, it is of course, but it’s expensive for me. So I’m gonna hopefully learn how to do this myself. I’ll be happy to share my endeavors would love to contribute to this thread in a positive way for others. As has been done for me. Thanks and best wishes everyone.
 

Patriot RAM

New member
Joined
Mar 31, 2016
Messages
5
Location
Arkansas
Tractor
Kubota L4701, Komatsu D21A-6
Hey guys, I need to re-pack the cylinders on my D21A and I'm looking for the best way to identify the model and locate the serial number. I think it's a D21A-6, but not sure how to confirm. I've located serial numbers for the transmission, hydraulic valve assy, fuel pump, etc, but for the life of me, I cannot locate the s/n for the machine itself. I think it may be covered by layers of paint, but I'm not sure. Would it be possible for one of you owners to tell me the exact location of your serial number, and possibly shoot a photo of it for me? I've searched and searched. Thank you so much!
 

krackerjack9

Bronze Member
Joined
Aug 20, 2007
Messages
84
Location
Orange Grove,Texas
Tractor
Kubota L4400
Can you provide pictures of what hydraulic lines you tapped into for your remote on the back of the dozer, I got a ripper all set up and for over a month I cant figure out how to make it work, I just dont understand or im using the wrong parts im at a total loss, if you can help I really appreiciated George [email protected]
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GuglioLS

GuglioLS

Veteran Member
Joined
Feb 13, 2005
Messages
1,135
Location
Edgewood, NM USA
Tractor
Jinma 354, 1953 Ford NAA Golden Jubilee, Komatsu Bulldozer
George,
Need to install a new double action valve between the pump and OEM blade valve. Remove the hose and hard line from the pump output all the way to the input of the blade valve. Install a new double action valve. Get a new hose made to connect from the pump output then into the input of the new valve. Then get a new hose made from the new valve back to the input of the blade valve. Basically all you need to do is put the new valve in series with the blade valve. In other words - Output of pump to new valve, output of new valve to input of blade valve. It's a simple in series hydraulic circuit. You will have to remove the floor plate, seat plate and seat riser plate to access to the blade valve hydraulic input fitting , and to remove the hard tube access to remove the valve input fitting really tight, but doable.

Why are there 6 hoses connected to what looks like an electric solenoid operated valve? normally 4 hoses, in, out and the two cylinder ports.

BTW the ripper construction looks really great. Nice work! Is it all home made? if not please share the source for the parts you used.

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