Takeuchi 153 FR (SLM)

[Rupert]

Hi all, so I’m writing just for a little bit of clarification I have a Takeuchi135FR with an offset boom and inside the cab there’s a switch. SLM switch. This is for the boom to retract it past the cab with a small bucket on. Personally I use it to get a higher lift when filling a lorry it is very helpful, it’s become a little bit stubborn, but it works now and again,(it gets worse as the day goes on. It seems like probably just me but I think it’s getting worse over time) but it does set itself automatically back to M when you turn off the machine that works fine. however, moving the switch to the S so will lift up past the cab the boom seems to just stop when it’s almost parallel i’m not sure whether that’s L or M but it’s definitely not S, I had the machine serviced and the guy said it was an issue with the switch which I don’t totally believe because if I switch it to S and it won’t go up, if I go down a little bit and use the app would momentum, it will almost feels like it pushes past the stop (it will only do this on S not on M or L .Whatever stops it It’s a bit jumpy once it goes that little further back and the more you do it the more it seems to go past easier until you either turn off the machine or switch the switch back.
I don’t want to go, willy-nilly buying lots of bits and pieces. Does anyone have any ideas? It might obviously be the switch I’ve had a look at the valves on the back of the boom and I don’t really know what I’m looking at but they don’t seem to move much whatever I do even when it was working, any ideas should I change the switch?
Or test it but where am I testing? for voltage?

Rupert

 

[V8Druid]

@Giles has one of these

 

[Giles]

We’ve got the tb180fr there is a mechanical stop as well dependent on position of the arm ac by pins check this is moving freely

 

[V8Druid]

We’ve got the tb180fr there is a mechanical stop as well dependent on position of the arm ac by pins check this is moving freely

assumed there would be some form of mechanical restrictor/lock out/pin somewhere ... presumably solenoid controlled by said switch

 

[Giles]

assumed there would be some form of mechanical restrictor/lock out/pin somewhere ... presumably solenoid controlled by said switch

No theres a physical 60mm ish pin on a cam which prevents the arm striking the cab in certain positions but if you were fully to the right where you can took the arm right in with say a grader on then you’d rip cab off

the switch allies you to specify bucket width

I’ve always been aware of it but other guy got in and contacted cab other day ppl aren’t used to being able to fold the arm in so close it’s been very Handy on current job using it as a crane being able to position load very close and also increase height of lift etc

 

[Rupert]

No theres a physical 60mm ish pin on a cam which prevents the arm striking the cab in certain positions but if you were fully to the right where you can took the arm right in with say a grader on then you’d rip cab off

the switch allies you to specify bucket width

I’ve always been aware of it but other guy got in and contacted cab other day ppl aren’t used to being able to fold the arm in so close it’s been very Handy on current job using it as a crane being able to position load very close and also increase height of lift etc

So you’re right, there is a 60mm ish pin at the bottom of the boom that is connected to the offset. So as you move it pulls the pin out, so the pin is definitely not the issue as it’s literally bolted to the offset mechanism so it’s literally pulled out and it looks like it clears it well but I will double check and clean up nice and proper.
And you’re right, it’s super useful specially with lifting I have a grab and it’s massive useful as the lift you’ve got is higher. Otherwise I guess you’ll need a bigger machine or a longer/shorter, boom/dipper.

So obviously the switch does something controls a solenoid or something along those lines. Do you think this could be the issue, it is sticking or something

So are we thinking it’s not the switch?

 

[Rupert]

I could take a picture of the switches, I can see on the back of the boom if that helps

 

[V8Druid]

so the S M L switch is presumably small medium or large (width bucket), so must be limit switches on the boom which the SML switch 'talks to' and governs the amount it will lift back in to the machine

 

[Rupert]

so the S M L switch is presumably small medium or large (width bucket), so must be limit switches on the boom which the SML switch 'talks to' and governs the amount it will lift back in to the machine

Yes that’s right the SML is bucket width, (small, medium large) I’m not with the machine right now but I will be tomorrow I can take a photograph of what the switches control.
As I look at it and I can’t really understand it all together, but you seem to have a lot more knowledge, and maybe can tell me what to investigate

 

[Giles]

I’ll ask my dad he’s intimate with ours as we had arm off for 6 months and had to oxy lance one of the rear pins out, the retainer had sheared a bolt the pin had moved up out of its seating and siezed. Right under all hydraulics and cab was a nightmare of a job all new 90mm pins etc cost us about 7k or more so dad was all over machine.

 

[V8Druid]

I’ll ask my dad he’s intimate with ours as we had arm off for 6 months and had to oxy lance one of the rear pins out, the retainer had sheared a bolt the pin had moved up out of its seating and siezed. Right under all hydraulics and cab was a nightmare of a job all new 90mm pins etc cost us about 7k or more so dad was all over machine.

remember that ... right bitch to get at buried under everything

 

[V8Druid]

Yes that’s right the SML is bucket width, (small, medium large) I’m not with the machine right now but I will be tomorrow I can take a photograph of what the switches control.
As I look at it and I can’t really understand it all together, but you seem to have a lot more knowledge, and maybe can tell me what to investigate

my best guess would be that as the limits're electrically determined and controlled, then the selected limit switch would be controlling the servo circuits control solenoid (be the easiest option), but may well have a dedicated solenoid valve purely for the boom up circuit too, which wouldn't then affect any other servo controlled function, which would make more sense.
Once the up/lift circuit's been triggered then only the down motion would be functional.
So in theory there would be a set of limit switches controlling the degree of lift with either a small, medium or large bucket installed (and chosen at the switch - machine won't be psychic ) ...
be interesting to know what the parameters are for each selection, but obviously with S selected, you should be able to get the absolute max lift, with the lift cylinder dead ended.
M would be the most interesting one as it could still be possible to catch the cab in some circumstances.
would guess there must be other limit switches in the swing linkages too, to tell it how far from the cab the base pivot position is

 

[CPS]

Check the wiring that comes through the parallel linkage to the boom... they are prone to go in there

 

[JerryRtilt]

I've had three FR's and to be honest never completely understood how the system works, the locking pin only functions when the boom is central or to the left, as it moves to the right the pin is released allowing the boom to fold back beside the cab, at which time the position of the switch limits the upward movement of the ram, on my 280 fr there is what i think could be a potentiometer at the base of the boom that monitors the movement, which is then restricted by what looks like a drop valve on the ram, I think
I'd be interested to hear from someone who is more familiar with the system, sometimes if mine has stood for a while, using it in the restricted lift position its very slow on the last bit of travel and sometimes there's a chattering vibration through lever ? Otherwise great machines (so long as you like a grease gun}

 

[Rupert]

I've had three FR's and to be honest never completely understood how the system works, the locking pin only functions when the boom is central or to the left, as it moves to the right the pin is released allowing the boom to fold back beside the cab, at which time the position of the switch limits the upward movement of the ram, on my 280 fr there is what i think could be a potentiometer at the base of the boom that monitors the movement, which is then restricted by what looks like a drop valve on the ram, I think
I'd be interested to hear from someone who is more familiar with the system, sometimes if mine has stood for a while, using it in the restricted lift position its very slow on the last bit of travel and sometimes there's a chattering vibration through lever ? Otherwise great machines (so long as you like a grease gun}

I did buy a PDF workshop and owners manual for my machine when I was looking into the issue, I did find something along the lines of
“to adjust the rate of travel…..when close to maximum lift”
I can’t remember exactly how it said to do it But I think you can, but I believe it is set so that when you get close to maximum lift you don’t come across it in a fast fashion as you might miss judge it and could accidentally hit the cab, and/or reach the full extent of the boom ram and damage the seals
if I fix my issue, I’ll let you know if I find how to adjust because I get it is slightly annoying when it slows down

 

[Mick-the-fitter]

I have worked on a few and one in particular wanted slew restrictor added for working on line side! A lot of over engineering just to offset the boom!

 

[JerryRtilt]

I have worked on a few and one in particular wanted slew restrictor added for working on line side! A lot of over engineering just to offset the boom!

Just been looking at the workshop manual pdf, think your right, had very little trouble with mine though.

 

[Giles]

I have worked on a few and one in particular wanted slew restrictor added for working on line side! A lot of over engineering just to offset the boom!

It’s not just to offset the boom though can turn in your footprint almost including bucket and arm etc, most zero swings it’s only the arse that counts for this you can work between builders etc where a normal arm would be in the way even with offset

 

[Mick-the-fitter]

It’s not just to offset the boom though can turn in your footprint almost including bucket and arm etc, most zero swings it’s only the arse that counts for this you can work between builders etc where a normal arm would be in the way even with offset

Agreed, although I have seen the wiring and hydraulic schematics for these machines on occasion and they are vast!

 

[JerryRtilt]

Downloaded the workshop manual for the TB280fr earlier, 528 pages