Some great Hondamatic unit info and pics - Honda ATV Forum
Honda Rancher Discuss all models of the Honda Rancher 350/400/420

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post #1 of 22 (permalink) Old 10-01-2012, 07:59 AM Thread Starter
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Some great Hondamatic unit info and pics

after having problems with my 400 at, i've been doing a lot of searching, reading, studying, and gathering of anything i've been able to find concerning these transmissions and how they work and what they're made of. i've added a link to the original patent info and details for atv's which have A LOT of great info on exactly how they work along with diagrams. also, i've attached some pics i found of a hondamatic unit that has been disassembled showing the various parts. hope this helps someone cause it certainly did me!

Rotationally balanced hydraulic swash plate plunger unit, and hydraulic continuously variable transmission incorporating same - Patent # 6996981 - PatentGenius
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post #2 of 22 (permalink) Old 10-01-2012, 08:14 AM Thread Starter
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sorry, forgot to explain each pic. first from left, fixed swash plate. 2nd, adjustable swash plate. 3rd, adjustable swash plate showing the rectangle slot where angle sensor attaches via joint shaft. 4th, swash plate worm gear drive and ball nut. 5th, cutaway view showing inside parts with another good view of what is controlling the angle sensor (small rectangle slot in middle of pic).

in the link, u can scroll down to "Detailed Explanation" which tells, in very technical terms but still informative, exactly how everything works. i have a saved pdf file of the info in the link which was too big to attach. if anyone would like it just let me know. VERY informative if u don't mind a lot of reading.
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post #3 of 22 (permalink) Old 10-01-2012, 03:18 PM
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Originally Posted by joeyglvr View Post
sorry, forgot to explain each pic. first from left, fixed swash plate. 2nd, adjustable swash plate. 3rd, adjustable swash plate showing the rectangle slot where angle sensor attaches via joint shaft. 4th, swash plate worm gear drive and ball nut. 5th, cutaway view showing inside parts with another good view of what is controlling the angle sensor (small rectangle slot in middle of pic).

in the link, u can scroll down to "Detailed Explanation" which tells, in very technical terms but still informative, exactly how everything works. i have a saved pdf file of the info in the link which was too big to attach. if anyone would like it just let me know. VERY informative if u don't mind a lot of reading.
Nice,did you locate the source of your particular problem,and how to fix it??? I wish Honda sold rebuild kits,or parts for the Hondamatics...

FREE REPAIR MANUALS >>https://www.hondaatvforums.net/forums...all-years.html 1986-1992 trx350 parts for sale>>https://www.hondaatvforums.net/forums/atv-parts-sale/29225-complete-part-out-1986-fourtrax-350-a.html
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post #4 of 22 (permalink) Old 10-01-2012, 06:41 PM Thread Starter
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Originally Posted by joeyglvr View Post
sorry, forgot to explain each pic. first from left, fixed swash plate. 2nd, adjustable swash plate. 3rd, adjustable swash plate showing the rectangle slot where angle sensor attaches via joint shaft. 4th, swash plate worm gear drive and ball nut. 5th, cutaway view showing inside parts with another good view of what is controlling the angle sensor (small rectangle slot in middle of pic).

in the link, u can scroll down to "Detailed Explanation" which tells, in very technical terms but still informative, exactly how everything works. i have a saved pdf file of the info in the link which was too big to attach. if anyone would like it just let me know. VERY informative if u don't mind a lot of reading.
Nice,did you locate the source of your particular problem,and how to fix it??? I wish Honda sold rebuild kits,or parts for the Hondamatics...
not yet. got it tore down and the motor ready to pull. probably pull it tomorrow. hopefully know something by the end of the week and i'll post what i find along with pics. i found a hondamatic unit that has a bad pump that i can get parts from as long as it's not the pump i need, which i don't think it is. hoping, as melsman thinks, that it's just a striped reduction gear though. on the bright side, this is a good time to rebuid the top end which it really needs!!

EDIT: got motor out. bout to at least pull front cover before bed. it's killing me not knowing....

Last edited by joeyglvr; 10-01-2012 at 10:06 PM.
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post #5 of 22 (permalink) Old 10-01-2012, 10:39 PM
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Those are great pics!

The piston cups (in pics 2 and 3) are a major point of wear and the main reason to keep your oil clean and fresh, with a little extra ZDDP added in for good measure.

Melsman
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2005 Rancher 400FA AT
Superwinch LT2000
24" Bearclaws
SuperATV disc brakes w/caliper flip
Kolpin front and rear trail boxes w/rack & fuel packs

2005 TRX400EX
13T front sprocket; EZ Pull Clutch
PRM full skid plates and side bars

2003 TRX250EX
22" Bearclaws on rear
DG Alloy Nerf Bars
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post #6 of 22 (permalink) Old 10-01-2012, 10:44 PM Thread Starter
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Those are great pics!

The piston cups (in pics 2 and 3) are a major point of wear and the main reason to keep your oil clean and fresh, with a little extra ZDDP added in for good measure.

Melsman
i keep seeing people talking bout ZDDP. what is that?? as i've mentioned, i've owned numerous manual shifts but this is the first auto i've ever had and it's all new to me. u been VERY helpful though!! thanks!!
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post #7 of 22 (permalink) Old 10-06-2012, 07:38 PM
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zinc, its what gives oil the clingyness. its what sticks to the internals when you have dry starts.
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post #8 of 22 (permalink) Old 10-07-2012, 12:43 AM
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Zinc<<<makes layers on the bearings surfaces which provides a layer of wear protection to protect the smooth surfaces of the bearings during start up,and for short periods of time during low oil moments..

FREE REPAIR MANUALS >>https://www.hondaatvforums.net/forums...all-years.html 1986-1992 trx350 parts for sale>>https://www.hondaatvforums.net/forums/atv-parts-sale/29225-complete-part-out-1986-fourtrax-350-a.html
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post #9 of 22 (permalink) Old 10-08-2012, 06:10 PM Thread Starter
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cool. where can i find some of that at? average parts store or an atv dealer?
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post #10 of 22 (permalink) Old 10-08-2012, 10:04 PM
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The diesel oils have a much higher amount than regular stuff.
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