JeremyF1015
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I have a Yanmar 1602D and I noticed today when I hit the brakes (going down a slope), only the right wheel locked up. Should both wheels have brakes or just the one?
Should both rear wheels brake on a Yanmar 1602? Or just one?
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RalphVa
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Does it have 2 separate brake pedals, side by side? Is the locking strip in place to make them both work together?
If yes to both, you may have a clip that has come off that works the left brake. It'll probably be underneath.
Ralph
If yes to both, you may have a clip that has come off that works the left brake. It'll probably be underneath.
Ralph
rScotty
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I agree with what Ralph and Winston said on brakes. Check the clip that connects the brake pedals and adjust the free play to be equal.
Also Jeremy, be very careful about putting on the brakes when going down a slope. Brakes work on pavement, but it's very rare that brakes will help much when the slope is dirt or grass. Braking on slopes is one of those weird tractor "gotchas" It's always much better deal to go down the slope in a low gear and do your braking by reducing throttle.
I'm just trying to warn you about braking on slopes because it is so counter-intuitive and the gotcha happens so fast.
Everyone who has ever operated a tractor can remember the butt-tightening moment when they found out that using the brakes going down a slope actually caused the tractor tires to begin to slide and speed up....and how they then had to GET OFF THE BRAKES in order to slow down.
rScotty
clemsonfor
Super Member
Yes they would need to be locked together, but if one is not adjusted the one that is will do all the braking as that set of shoes contacts first and because the petals are locked together the other side will not be pressed far enough to have the shoes make contact. There is linkages under the floorboards to adjust it till they make contact if that's the issue. Also a common issue in these tractors is for the brake shoe shaft that pivots the shoes to become stuck therefore not allowing that side to pivot the shoes into the drum. I have a post on this, where I go through the problem and me fixing it, I can link too when I get a second to search for it.
rScotty
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Yep, the design of the brakes on the old Yanmars is a mystery. Unlike almost every other feature of these classic tractors, the brake design is just terrible. That is so unlike Yanmar that there is probably an interesting story there. Truth is, a high school shop class could have designed them better.
Luckily, the Yanmar brake designer did maintain the philosophy of making it easily owner serviceable. So expect to scrape off the corrosion, replace the springs, and put some thought into venting the backing plate and lubing all the pivots. The drum is often too deeply pitted to be lathe-turned successfully - but turning will help for awhile. I've wondered about making the drum out of different alloy or depositing a different metal on the inner friction surface.
luck beats good planning
rScotty
Luckily, the Yanmar brake designer did maintain the philosophy of making it easily owner serviceable. So expect to scrape off the corrosion, replace the springs, and put some thought into venting the backing plate and lubing all the pivots. The drum is often too deeply pitted to be lathe-turned successfully - but turning will help for awhile. I've wondered about making the drum out of different alloy or depositing a different metal on the inner friction surface.
luck beats good planning
rScotty
normde2001
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"Yep, the design of the brakes on the old Yanmars is a mystery. Unlike almost every other feature of these classic tractors, the brake design is just terrible"
What do you not like about the brake design?
What do you not like about the brake design?
normde2001
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"Yep, the design of the brakes on the old Yanmars is a mystery. Unlike almost every other feature of these classic tractors, the brake design is just terrible"
What do you not like about the brake design?
What do you not like about the brake design?
rScotty
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What I don't like is that they corrode so easily. These tractors evolved axle deep in rice paddys, and the material selection and venting of the brakes just doesn't make sense with that kind of history. Compare Yanmar's brakes with passenger cars of the early 20th century. They all had had drum brakes very similar in concept and didn't have the accelerated corrosion problems.
I DO like the way that Yanmar put the braking on the countershaft instead of the axle shaft. Better use of braking torque that way, and enables smaller brakes with mechanical actuation.
I DO like the way that Yanmar put the braking on the countershaft instead of the axle shaft. Better use of braking torque that way, and enables smaller brakes with mechanical actuation.