Thanks for joining the forums, Bru, we value Toyota owner/members and their input! What is the application for your R154 Aisin transmission?
The AX15 transmission rebuilding how-to article has been popular, and for those interested in seeing my easy-to-make stands at work, view steps #67 and #70 on the Part 1 page: http://www.4wdmechan...Inspection.html.
At left is the pair of stands in action. At right is a drawing of the Miller 8227 cage tool.
I took my tape measure to the stand “tool", and these angle stands are approximately 10-3/8” to the platform top. The angle is 3” by a minimum of 1/4" thickness. (They are considerably thicker at the actual angle portions.) I match cut the angle pieces to 10” length, the top plates are common ¼-inch thick cold rolled strap stock, welded with my MIG using 0.035” ER-70 wire. I’m never sparing with welds, inside and out in the case of these top plates.
This is a structural tool and takes a lot of pressure on the stand. On that note, the Miller caged tool adds a safety feature that you could improvise with strapping between the legs: Consider metal straps either welded or securely bolted to keep the legs from skittering apart. Even ratchet straps around the two stands (like 1500# rated motorcycle tie-downs) would be advisable if you suspect that the stands could kick outward under force with a particular job. I've personally not had an issue, always making sure the force goes downward. Judge the load by the flex at the top platforms.
Caution: Any time you use a press, the force is a risk. Be especially careful when pressing off bearings. Make sure the plates make contact with the inner bearing collars; do not apply pressure strictly to the outer race of a caged bearing! The force could break the bearing apart and cause parts to fly out with extreme force. Use goggles or eye protection when pressing.
I tossed this stand set together in a half hour for some long ago transmission project, and the combination of the press deck plates with through holes and the height of the stands has worked very well for me. You’re compressing stout 3” angle for the most part, the ¼” plate stock has offered enough support for these kinds of bearing and gear diameters—the 1/4" top plates are still straight after years of use! You can always modify this design/approach for a specific or repetitive task.
On this note, there's only one feature I'd like to add to my hydraulic press: a pressure gauge. I'm using air-over-hydraulic pressure and am very good at "guess-timating" pressure applied. (Over 45 years of this work helps here.) However, it would be very useful to narrow down actual apply pressures. Years ago, in my early years at the mechanic's trade, we were given specific press pressures for given tasks, like pressing on an axle shaft bearing or lock ring. Today, even factory manuals seldom provide this insight and use brusque instructions like, "Use a suitable press." Really?
You’ll become very attached to the New Britain snap ring pliers…a good find! When spreading snap rings, control is everything. You can help prevent the time-honored risk of distorting or over stretching a ring by using a quality pliers.
Looking forward to your posts, Bru. Welcome to the forums!