TRACTOR PARTS Allis Chalmers Case & David Brown Farmall & International Ferguson Ford & New Holland John Deere Massey Ferguson Massey Harris Minneapolis Moline Oliver & Cockshutt Kubota / Yanmar

TRACTOR MANUALS

Allis Chalmers	Case	Farmall IH	Ford 8N,9N,2N	Ford
Ferguson	John Deere	Massey Ferguson	Minn. Moline	Oliver

Crawlers, Dozers, Loaders & Backhoes Discussion Forum

D21-5 Komatsu Dozer stopped, won't start

Welcome Guest, Log in or Register

Author

Walter Baker

09-17-2003 16:50:50

Report to Moderator

Stopped dozer to use another piece of equipment, went to restart it within 30 minutes, and it wouldn't start. Turning key to start results in one "click," like the relay switch on starter. Battery seems to be charged. There is 24 volts on heavy wire to "can" on starter. What is this can? Is it the relay, or a capaciter? It is labeled "24 Volts." I have a service manual, but it does not included wiring. Thanks for you help. Walt

[Log in to Reply] [No Email]

Walt

09-20-2003 13:01:11

Report to Moderator

Re: D21-5 Komatsu Dozer stopped, won't start in reply to Walter Baker, 09-17-2003 16:50:50

Thanks to everyone who gave me their ideas, the dozer is back at work. I still have to fix the problem right, but it is jury-rigged now, and can be started at any time. Does anyone know where I can get a copy of electrical drawings for this machine? Also, is there a quick way to determine if solenoid switch is bad, verus the netural lockout switch? Again, thanks for your input. That's what I like about this site--real answers! Walt

[Log in to Reply] [No Email]

901 charles

12-16-2005 08:47:26

Report to Moderator

Re: Re: D21-5 Komatsu Dozer stopped, won't start in reply to Walt, 09-20-2003 13:01:11

Have the same problem with my D31P. What did you find to be problem? I went around safety switch and I can start by shorting out the soleno

id and hot battery cable.I think problem is the switch or solenoid. Thanks for any help.

[Log in to Reply] [No Email]

jeff-pa

09-11-2006 09:42:38

Report to Moderator

Re: Re: D21-5 Komatsu Dozer stopped, won't start in reply to 901 charles, 12-16-2005 08:47:26

i also have a d21-a5. it wouldn"t roll over. i jumped the back 12volt battery with my truck and it started right up. i ran it for 8 hours and shut it off and it wouldn"t start again without a jump on the back battery. at that time i measured 12.4 volts on the front battery and 11.7 on the back battery. when i got it running again i checked both batteries at 12.4v and 12.1v shouldn"t i be seeing 13 volts on one or both batteries while the machine it running. i am questioning the alternator, is there any other tests i can do?
thanks

[Log in to Reply] [No Email]

bcPA

09-19-2003 08:25:50

Report to Moderator

Re: D21-5 Komatsu Dozer stopped, won't start in reply to Walter Baker, 09-17-2003 16:50:50

If poor contact of batt cables is the problem here is a tip I like. Watch the terminals preferably in the dark when you or helper hits startes switch. YOU may see a spark where the problem is. You can also feel the cable ends with your bare hand after pushing the starter switch a few times. Look for a warm connection. The good connections should be stone cold while a warm one will indicate a dirty connection.

[Log in to Reply] [No Email]

Oldfarmboy Jim

09-18-2003 22:59:10

Report to Moderator

Re: D21-5 Komatsu Dozer stopped, won't start in reply to Walter Baker, 09-17-2003 16:50:50

Take the cables off the battery and wire brush those terminals. Your symptoms are classic. If cleaning the battery connections doesn't fix the problem, I'll refund whatever you paid me for the advice. Good luck, Jim

[Log in to Reply] [No Email]

Jim

09-18-2003 18:51:16

Report to Moderator

Re: D21-5 Komatsu Dozer stopped, won't start in reply to Walter Baker, 09-17-2003 16:50:50

I am not sure on the D21 but the large Komatsu dozers have a relay bu the starter so that you can not start with the engine running - the relay is ran off of the R terminal on the alt. If the doide goes out on the alt there is power coming out of the R terminal and can not start the machine. Trun the key on and see if the battery light comes on if not check the r terminal on the alt - if has power that is the problem should only have power if alt is turning.

[Log in to Reply] [No Email]

09-18-2003 15:15:10

Report to Moderator

Re: D21-5 Komatsu Dozer stopped, won't start in reply to Walter Baker, 09-17-2003 16:50:50

That "can" is the solenoid switch for the starter motor,it has two functions,when you select the start position the magnetic coil inside pulls a plunger that engages the starter gear with the ring gear on the engine flywheel,it then pushes a contact plate aginst the two heavy connections on the back and sends current into the starter,make sure all the cable connections are clean and tight including the earth,check that the battery insulator solenoid clicks in when you switch on,you could try crossing the solenoid from the main cable to where the light wire goes,make sure the machine is out of gear and the brake set,a tap on the solenoid has been known to work in case the plunger is sticking.AJ

[Log in to Reply] [No Email]

Pete

09-17-2003 16:56:10

Report to Moderator

Re: D21-5 Komatsu Dozer stopped, won't start in reply to Walter Baker, 09-17-2003 16:50:50

It is possible for the battery to carry a hot surface charge but have a shorted cell. Putting the battery under load with a tester will show if it is good. Pete

[Log in to Reply] [No Email]

[Options] [Printer Friendly] [Posting Help] [Return to Forum] [Log in to Reply]

TRACTOR PARTS	TRACTOR MANUALS

We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]

Home | Forums

Copyright © 1997-2023 Yesterday's Tractor Co.
All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy

TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.

Yesterday's Tractors - Antique Tractor Headquarters

Website Accessibility Policy