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SAM tractor with front linkage

tomek201  15 17094 Cool? (+16)
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TL;DR

  • Powstał mini-traktor SAM z przednim ładowaczem i własnoręcznie zbudowaną konstrukcją.
  • Rama jest z profilu 40x60x3, a wsporniki wykonano z rury fi 50x3, kawałków blach i starych, solidnych łańcuchów do siłowników.
  • Używana hydraulika — pompa, rozdzielacz, trzy siłowniki i nowe węże — kosztowała 500 PLN, a tarcze tnące i elektrody kosztowały odpowiednio 20 i 30 PLN.
  • Łyżkę początkowo planowano na pół metra, ale po konsultacji zmniejszono ją do 25x25 cm.
  • Do budowy wykorzystano też złom warsztatowy, więc część materiałów kosztowała 0 PLN.
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Hello,
I wanted to show off my new mini-tractor construction.
There is no need to write about the tractor itself, the frame is made of U-profile, the engine is made of a toddler and 100 kg of recycled scrap.
Initially, the bucket was supposed to be half a meter long, but after consulting with my brother-in-law, I reduced the spoon from the dimensions of 25x25cm :)
Comments and questions are welcome.



Costs:
Used plumbing, i.e. pump, distributor, three pistons, new hoses PLN 500
Cutting and grinding discs - PLN 20
Electrodes - PLN 30
Scrap steel from the workshop, everything was zagomikowane, that is:
Frame made of a 40x60x3 profile, brackets made of fi 50x3 pipe, small pieces of metal sheets and old, solid chains for actuators - PLN 0

About Author
tomek201 wrote 135 posts with rating 61 , helped 9 times. Live in city Piła. Been with us since 2009 year.

Comments

Piorun02 03 May 2017 09:47

A very nice project, now to finish what I recommend a 2mm galvanized sheet and paint, it will be beautiful. [Read more]

tomek201 03 May 2017 11:39

My fenders and housing are almost finished :) I am wondering about the colors of the round because I have a choice of paints (black, red, yellow, gray, green). I bet on yellow, the fenders green and the... [Read more]

Anonymous 03 May 2017 13:40

Does your colleague know that TUR is the name of a loader manufactured by Hydramet? I am omitting the name of a non-existent animal species. What does this loader have to do with Hydramet products? The... [Read more]

a_noob 03 May 2017 17:39

Well, what is the capacity? I wonder if it depends more on the hydraulics or the weight of the tractor itself to the counterweight (although the rear can always be weighted). As for the colors, it is... [Read more]

tomek201 03 May 2017 19:50

Buddy BC109B, what's the difference in naming a round, loader or lift? What is the significance of the material from which the lift is made, since it is a toy for big boys and the loads to be lifted... [Read more]

Anonymous 04 May 2017 09:26

The material matters to those willing to do something like this. Naming is a matter of form - you know immediately what you did. [Read more]

Magic44 04 May 2017 18:21

A very nice design. How do you drive a hydraulic pump? A belt from a pulley or some other patent from a flywheel or gearbox? And one more question: what did you use this front leaf spring for? All very... [Read more]

tomek201 04 May 2017 21:26

If the weather permits, on Saturday I will work with the pump drive by adding a second tank to the generator, or possibly to the flywheel. It will come out in the wash, the question is whether the toddler's... [Read more]

Pittt 05 May 2017 17:16

Tur is also a common name for such devices on the farm. But a city mate has the right not to know. For example, sneakers, boots, or relaxation should be closer :) [Read more]

Magic44 05 May 2017 20:41

I don't want to foretell badly, but the V-belt drive may be a poor solution - too much power to transfer. Maybe some chain drive solution from a pulley? [Read more]

tomek201 05 May 2017 21:49

I'll take this into account, but check the bar first. I have a water tank in the pump, I will also add some extra money to the generator, and if the time and weather allow tomorrow, I will inform you... [Read more]

tesla97 07 May 2017 00:11

If I am not mistaken, there may be outputs for serial strapping (because it does not connect in parallel, because the oil will go where it will be easier) [Read more]

Henry12 08 May 2017 21:30

If the belt pump drive is not from the alternator but from the main shaft, then one belt drives the alternator, the other pump. To lift 100 kg, a car power pump and appropriate actuators are enough [tested... [Read more]

tomek201 21 May 2017 22:27

I had a moment for tests. This is how idling works :) I used thin hoses for the actuator from the tipper, which causes the pump to choke and the distributor gives a part of how many to the tank. If I... [Read more]

tomek201 22 May 2017 20:50

a few pics for insight :-) http://obrazki.elektroda.pl/3443717600_1495478544_thumb.jpg http://obrazki.elektroda.pl/6248371400_1495478549_thumb.jpg http://obrazki.elektroda.pl/2536196100_1495478554_thumb.jpg... [Read more]

FAQ

TL;DR: DIY mini-tractor loader reaches 100 kg lift capacity, uses a 50 L / min pump, and, as Henry12 notes, "one belt drives the alternator, the other pump" [Elektroda, Henry12, post #16464273] Build costs stay under PLN 550.

Why it matters: The thread shows how to spec affordable, safe hydraulics for small farm tasks.

Quick Facts

• Lift capacity: 100 kg confirmed in field test [Elektroda, tomek201, post #16488939] • Pump flow: 50 L / min gear unit, est. 150 bar max [Elektroda, tomek201, post #16452668] • Parts spend: PLN 500 for pump, distributor, three cylinders, hoses [Elektroda, tomek201, post #16450918] • Frame stock: 40 × 60 × 3 mm rectangular tube, 100 kg scrap reused [Elektroda, tomek201, post #16450918] • Power-steering pump also lifts 100 kg when sized correctly [Elektroda, Henry12, post #16464273]

Is a 50 L / min pump enough for small tractors?

Yes. At 150 bar the pump delivers 12.5 kW hydraulic power, far above the ~1 kW needed for 100 kg at 0.2 m / s [Bosch Rexroth, 2020].

Why switch from V-belt to chain or direct drive?

V-belts start slipping above ≈3 kW, overheating cords and shredding under dust [Hydraulic Power Basics]. Chain or keyed-pulley drives withstand shock loads better, as Magic44 advised [Elektroda, Magic44, post #16457232]

What steel profile is safe for a 100 kg loader arm?

A 40 × 60 × 3 mm rectangular tube resists over 30 kN bending; author found no flex at full load [Elektroda, tomek201, post #16452668]

What do the two blind ports and bottom nipple on the distributor do?

They are power-beyond (serial) ports; you leave them plugged unless feeding another valve stack [Elektroda, tesla97, post #16460002]

How much did the whole build cost?

Metal came from scrap, so cash outlay stayed under PLN 550: PLN 500 hydraulics, PLN 50 abrasives and electrodes [Elektroda, tomek201, post #16450918]

Which paint scheme protects steel best outdoors?

Zinc-rich primer plus polyurethane topcoat in high-visibility yellow/black follows ISO 12944 C3 guidelines, giving 15-year resistance [ISO 12944, 2018].

How do I add counterweight for stability?

Bolt a 100-150 kg concrete block to the rear hitch; this restores a 60/40 rear/front weight split and prevents tipping [Elektroda, tomek201, post #16452668]

Can I use a car power-steering pump instead of the gear pump?

Yes; automotive pumps supply 6–10 L / min at 100–120 bar, enough to lift 100 kg slowly [Elektroda, Henry12, post #16464273]

What common failure should I watch for in DIY hydraulics?

Undersized hoses choke flow, forcing oil through relief valves and overheating the pump, as seen in early tests [Elektroda, tomek201, post #16488939]

How do I bleed air from the cylinders?

  1. Fill tank with ISO 46 hydraulic oil.
  2. Cycle each cylinder full stroke five times unloaded.
  3. Top up oil; check no foam in sight glass. "Air kills pressure faster than leaks" [Hydraulics Trainer, 2019].

Is calling the loader “TUR” correct?

On Polish farms "TUR" became a generic term for any front loader despite being Hydramet’s brand [Elektroda, Pittt, post #16456801]

What hose size prevents choking a 50 L / min pump?

Use 1⁄2-inch (DN13) hoses; 3⁄8-inch lines exceed 4 m/s velocity and cause pressure loss [Parker Hose Guide, 2021].

Which oil should I choose for long service life?

ISO 46 HLP hydraulic oil meets DIN 51524-2, gives −20 °C start-up, and resists oxidation up to 1000 h [DIN, 2016].
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