Simplicity Sovreign:
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Garden Tractors
Forum Description: A great place to discuss the Simplicity and Allis Chalmers Garden Models
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=205917
Printed Date: 31 Oct 2025 at 2:05am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: Simplicity Sovreign:
Posted By: Codger
Subject: Simplicity Sovreign:
Date Posted: 17 Mar 2025 at 6:13pm
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My tractor has a Kohler TH18 series engine which is of the "Triad" family. It looks just like a CH18 series which is the "Command" series. Anybody know the differences between these two series? Mine is puking oil out from the crankshaft seal on the PTO side and the seal is NLA from Kohler, or Simplicity. I have one ordered but I measured the dimensions and went with an industrial seal which should work. Until this oil leak presented itself and ordering seals for the "Command" series, I discerned which engine this actually is via the owner's manual that came with the tractor. Never have heard of the "Triad" series myself.
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Replies:
Posted By: Codger
Date Posted: 18 Mar 2025 at 5:06am
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Internet searches show this engine to be rather "short lived" being replaced by the "Command" series of engine. The "Triad" series was a single cylinder block with integral heads casting with cast iron sleeves. The engine was known to pull the sleeves down destroying the engine which ultimately lead to it's demise and replacement by the latter series. After looking at mine last evening, it clearly does not have removable cylinder heads. I seen several references to where Kohler offered adapters and such to replace this engine with the later Command series after being sued for a lot of money over the engine series. Mine runs well and has always been kept clean but I read where heat is the vital enemy of these engines starting with buildup of chaff and such in the cooling fins. I found the needed seal which is long discontinued by both Kohler, and the aftermarket. However, it is a common seal once measurements are derived and one is on order as I type this. Really is a nice little tractor and the tiller works well. Daughter and family are going to get good use of it later this month into early next with preparing their garden which is expanding. ------------- That's All Folks! |
Posted By: Codger
Date Posted: 10 Apr 2025 at 5:07am
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Sourced a new oil seal and was out in the yard punishing the tractor as a whole before placing it back into service when a hydraulic line for the lifting apparatus let go. Removing the line required removal of four other lines, and steering column from the tractor. I then found a pinhole in the return line to the hydraulic pump. Simplicity in ultimate cheapness installed 400psi hydraulic hose. This is basically a good quality air hose. That is not a slanted evaluation as this hose is single fiber braided and marketed as "General Purpose Usage":   So nice to be able to fabricate your own hoses as needed that both fit, and route well as noticed the tiller drive belt getting into the supply hose in the original routing. I replaced all hoses with 3000psi quality 100R17 hose rated at 3000psi although the system will never generate that high of pressure. A new drive belt is ordered:   ------------- That's All Folks! |
Posted By: Codger
Date Posted: 02 May 2025 at 2:34pm
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Mower works and performs much as when new. New belts, new hoses, newer tires and factory wheel weights in the rear. It is smooth, stable and stripes well. Mower has obviously been maintained well so I'm happy. Now with a good couple of hours run/work time on it, the transmission oil and filter will get changed. Power steering is a very nice option. My wife although in her mid 60's still has a nice ass that's not sliding down the back of her legs so going to get a new seat also to be comfortable. ------------- That's All Folks! |