Steering clutch/brake inspection.

Forum Forums Bulldozer & Excavator Operation and Maintenance Steering clutch/brake inspection.

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    • #30470
      Bob Rooks
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        Thought I would start this thread so I don't take up space on Greg's, and to eliminate any confusion. I should be starting on this project in January during my vacation but there is going to be a change in my work schedule so I still have to see how that will shake out.

        Anyway, the shop is coming along. Still have another gantry to set up in the other bay and clean up the mess, and a few more doo-dads to add. wink

         

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      • #33921
        RichWaugh
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          Man Bob, that floor is shiny!  Looks like any oil you spilled wold bead up like water on that.  hailking

        • #33922
          Bob Rooks
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            The floor has two coats of this stuff (you won't find it in hardware stores). It's like clear steel and actually strengthens the cement. Makes it real easy to keep clean too.

             

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          • #33924
            Tinbender
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              Hope you had the doors open when you put it downlaugh

            • #33925
              Bob Rooks
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                “Hope you had the doors open when you put it downlaugh

                Yes! That stuff is NASTY! VOC of 700! I'll bet it cleared the forest of wild animals for a half mile. wink

                 

                The new workbench arrived yesterday. Problem is, I have to build it. embarassed

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              • #33927
                RichWaugh
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                  Oh yeah – some assembly required…roflmao

                • #33931
                  Bob Rooks
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                    Some?? roflmaoroflmao More like build from scratch. roflmaoroflmao

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                  • #34227
                    Bob Rooks
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                      Update on my steering brake mod. It works great and I'm very pleased with it's functioning. There is a better feel for when the clutch releases and the brake is applied. There is also less pedal movement required.

                      I tried to take some pics and a video but the space where all the action takes place makes it almost impossible.

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                    • #34277
                      Bob Rooks
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                        Here is the pic of the mod. The geometry configuration of the cable allows for twice the take up rate of the brake actuating arm over the straight rod linkage, compensating for the slack in the actuating links at the brake band anchor points (and it feels like power brakes too).

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                      • #34278
                        CTOA
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                          I assume before it was just a straight connection between the break and the foot petal?

                          CTOA - Founder

                        • #34270
                          Bob Rooks
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                            Correct.

                            “The geometry configuration of the cable allows for twice the take up rate of the brake actuating arm over the straight rod linkage…”

                            Nothing was broken.

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                          • #34271
                            RichWaugh
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                              That's a really excellent mod, Bob!  Elegantly simple solution to the problem and only adds one moving part to the assembly.  Hard to beat that when you net a 2X take-up rate on the brake bands.  That looks like one the factory should incorporate, though it is simple enough that it can be done by anyone with a few hand tools and a bit of time.  Well, and a crawlie that need it…makes me wish you owned a wheelie so you could come up with similar great ideas for it that I could actually use myself.  roflmao

                            • #34279
                              pepage
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                                You all are going to have to talk real slow now. I had trouble wrapping my brain around the 2x take up rate but now I see it.

                                http://www.the-office.com/summ…..basics.htm

                                What you have is a movable pulley system as I see it. Your foot pressure would be the weight and the force on the brake lever P. Does this mean one would have to push twice a hard on the pedal with this pulley system versus a straight lever system?

                                More to follow when we can talk faster.

                              • #34280
                                Tinbender
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                                  You should have to push half as hard, with the wire rope sheave acting as a snap block.readin hmmm

                                • #34281
                                  Tinbender
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                                    BTW, excellent work Bobcool

                                  • #34282
                                    Bob Rooks
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                                      Thanks guys.

                                      Pete,

                                      There are more forces involved than a simple class 2 pulley system. The movable pulley anchor point is about 3″ up from the pivot (fulcrum for the second class 1 lever system) point. The distance from the pulley anchor point is over a foot. There is a tremendous mechanical advantage there that overcomes any losses in the pulley system. In essence, the pulley system efficiency is compounded.

                                      Hope that explanation works. laugh

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                                    • #34283
                                      pepage
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                                        That helps… now off to school I go.

                                         

                                        Edit:

                                        Ouch, makes my brain hurt. When I retired, I think my brain also retired. Looks like I will have to make a model and do it empirically. Like, what would happen if the pulley was on the break arm instead of the pedal?

                                        Some additional questions Bob:

                                        How do you plan to adjust for brake wear?

                                        How did you make sure the steering clutch was open before brake was applied?

                                        Unrelated to mod….How did you adjust your steering clutch?

                                        Bob, I think you can start wearing your cape.

                                        Phil

                                      • #34284
                                        Bob Rooks
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                                          Some additional questions Bob:

                                          How do you plan to adjust for brake wear?

                                          There is no real adjustment for that per se, but the pedal travel is adjusted by taking up on the eye bolt.

                                          How did you make sure the steering clutch was open before brake was applied?

                                          Actually, I didn't touch the clutch adjustment, it was still within spec. It still fully releases after about 1-1/2″ to 2″ of pedal travel, at which time all of the slack is out of the brake band and it is being applied from that point on at 2x the normal rate, so you actually have less pedal travel to achieve full braking capacity.

                                          Unrelated to mod….How did you adjust your steering clutch?

                                          By the book. laugh

                                          Bob, I think you can start wearing your cape.

                                          roflmaoroflmao At no point did I say we have reached the promised land, and I have no idea why I insist on calling you Pete. roflmaoroflmao

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                                        • #34288
                                          Bob Rooks
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                                            Phil wrote:

                                            Like, what would happen if the pulley was on the break arm instead of the pedal?

                                            Then the take up rate would be about one-half that of the OEM rod linkage, giving no advantage in this case. It's explained pretty well in your link.

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                                          • #34291
                                            pepage
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                                              Bob,

                                              You are correct AGAIN! With the pulley on the pedal, the short wire gets longer as the pedal is depressed. With the pulley on the brake arm, the short wire gets shorter when the pedal is depressed.

                                              When I post, I sometimes toss something in at the end that is thoughtless.

                                              Phil

                                            • #34286
                                              Bob Rooks
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                                                No worries Phil. wink

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