Do-it-yourself mtd 790 repair

Summer Resident I wrote:
growled, I'll go mow the wilds of an unscrupulous neighbor, otherwise it's scary to look there

Fine. Preparing for the move. Where? I have already decided.

I squinted, tomorrow I'll go, great! The work is complete, I will mow the willow tree, with a mill.

Good day!
Tell me, plz, where can I get it in email. a diagram of work and a description of carburetors for MTD 790?
I myself am not a mower, my father asked me to find information on the internet. He has some kind of dips in the spit, chtoli. So he wants to look and study the principle of operation of this carburetor.

I looked for a carburetor schematic but couldn't find it. On my scythe, I just blew the carburetor with a compressor and that's it, I went up the hill

, and before that it worked only at idle. And I also disassembled the gearbox, lubricated it and made a hole in the side for lubrication. By the way, in any book on tractors there is a device and operation of a diaphragm carburetor, it was put on starting engines.

I am reporting. I have been using the oblique for the second year.
It mows well, the power is sufficient. The ability to use a disc, as well as the fact that the braid has a collapsible bar - make it very convenient.
But next time - I will not buy MTD.
For a year I had to change the carburetor. Failed almost immediately, and, as it turned out, "the carburetor is not covered by the warranty." Oh, how sweet! And what does it cover? On the cardboard box in which the braid is packed or what? I waited a month and a half, gave 500 rubles for the "repair" and 1000 rubles for the carburetor. A lot of people told me about “Chinese and Mexican carburetors”, they accused me a lot of crooked handles.
In short, I don't want to get involved with MTD anymore.

Hello comrades in misfortune.
So my MTD 790 was covered for the second time. (The last). You pull the rope, but there is no resistance and nothing turns. The first time was about the same. I drove it under warranty. The service is disgusting. After
months of ordeals in Moscow he took to Krasnoarmeysk. There they began to breed for pistons, rings, the wrong mixture, etc. They agreed on 500r and they will do it now or in 2 weeks under a guarantee. I gave the money. Mowed 4-5 times over the summer. I worked for a year and again so bad. I will not repair. I decided not to save money and bought HUSQVARN 325RDX. MTD is not a reliable technique and service is disgusting.
I will not contact her again.

2Aleksey A. Good afternoon. It's a shame, of course. Mine is still working. In March, I sawed a lot of twigs and branches. The garden was cut off. I have already mowed the grass twice this year. It seems so far there are no problems.

von carens wrote:
there is no resistance and nothing is spinning

What happened? What was being repaired?

Zed wrote:
I looked for a carburetor schematic but couldn't find it.

Why is it needed? There are problems then 2

The jets are clogged or the membrane is leaking.
PS: if you really want to look here, they gave links to the chainsaw device with detailed diagrams (carbohydrates already in the context ) IMHO they are similar

QUOTE = Private trader] What happened? What was repaired? [/ QUOTE]

I never really got the diagnosis. In the service (Krasnoarmeysk), a hanyga came out and began to convince me that I had killed her myself and that the piston and rings had to be changed. And it costs 3600. When I replied that it would be better to buy a new one and went to the chief, they said that they would try to do it. But the symptoms were similar.

von carens,
Do you have the braid itself?
My starter flew today, it doesn’t catch.
Can you sell what's left?

Yes, please, you just need to bring it from the village and pick it up.

Grenkin wrote:
Can someone tell me what can be done?

First you need to remove and try to flush the fuel filter located in the gas tank.
Then you can try to completely disassemble the carburetor and blow it with spray to clean the carburetor. Just be careful not to lose the spring.

Andrey T.please, at least in a nutshell, how to remove the fuel filter in the tank? The instruction does not write anything about this at all. Just so as not to sort out too much.

Grenkin wrote:
how to remove the fuel filter in the tank?

To do this, hook it with a hook and pull it out through the neck of the tank.
Wire hook not included

I looked into the tank. There you can see the end of the tube leading into the primer and a white plastic cylinder inserted into a cylindrical casting at the bottom of the tank. Is this a fuel filter?

Grenkin wrote:
Is this a fuel filter?

Hehe, hook. Figwam, as they say. It can only be pulled out from there with pliers, and then if you grab it and do not break it off. In short, it's a pity that I got to this forum after purchasing the MTD braid. Kose is not even two months old. Unreliable, capricious, there is no sensible description of maintenance in the technical documentation. Why is it interesting for me, as a consumer, to find out the description of the carburetor and the procedure for its assembly and disassembly in some guerrilla way on the forums? The manufacturer had to take care of this. For any car there is a manual for operation and repair. The owner has the right to contact the service, but if he wants to try his hand or thinks that he will do MOT to his device faster, then in a good hour, as they say. Immediately in the description, the only option is offered - "Pull the pumpkin, if it doesn't work, go to the service." In short, MTD is a floppy.

I took the scythe to the service. It turned out that a fine filter was clogged in the carburetor. Half an hour business. Why couldn't the information on how to get to the fine filter be included in the instructions?

Grenkin wrote:
The owner has the right to contact the service, but if he wants to try his hand or thinks that he will do MOT to his device faster, then in a good hour, as they say.

Grenkin wrote:
Why couldn't the information on how to get to the fine filter be included in the instructions?

According to statistics, the weakest link in the work of technology is the user. For one user with straight arms, there are nine - with curves, and the instructions are written so that the technique will last as long as possible. By the way, for this reason, seals were invented.
It would be interesting to know what you are comparing with. I advise you to read, for example, the instructions for the Oleo-Mac, Pubert, Caiman technique, which consist of only one or two pages. And the comparison of mini-garden equipment with a car, in my opinion, is incorrect. Yes, and I have not yet seen a description of replacing the fuel filter in the instructions for cars, maybe I looked badly.

"According to statistics, the weakest link in the work of technology is the user."
Not with MTD. In the case of MTD, the weak link in a technique is the technique itself. After the repair, the scythe worked for about three minutes more. Then she began to slow down. When gas is added, stall. After another couple of minutes, she refused to start. In general, everything is like the first time. Now back to service. Maybe after a few more minutes it will work.

Grenkin wrote:
After the repair, the scythe worked for about three minutes more.

Have you changed your fuel filter?

Andrey T. wrote:
Have you changed your fuel filter?

That's it

No, they haven't. Fucked up, mlyn! But today they have already changed. The master said, in fact, these filters are disposable, but last time he decided to blow it out, he thought it would help. "Did not help? Okay, I'll change it then. ” Thank you even though I didn’t ask for money a second time.
Well, I say, our people cannot live without a manual for operation and repair. It's good that I live in a place where workshops are like mushrooms after rain. But even then, excuse me, it is not enough joy to ride to them several times. And if it were 80 miles from me to a decent city, would I be so pleased?

Grenkin, welcome.
Yes, exactly the same crap was with me. In training (I have a swimming category) I was less tired than when I tried to start this braid. The primer was also empty. He also rocked back.
And no poultices, including replacing the primer, helped. Until the carburetor has been changed. 1000 rubles a caburetor, 500 "repairs" (of incomprehensible content, or simply - none) - and this is a miracle of technology in feathers - again with me and in the ranks.

Private owner, good!

Kosa and me so far, Thank God - it works. But I already told myself that her next failure will be her last failure. It costs too much. But on the other hand, the old rule is confirmed: "the miser pays twice." It would be better if I immediately bought a high-quality braid.

Alexey A. wrote:
buy a high-quality braid immediately

You are probably right. But it costs too much for my needs. For example, ”>

Here's a new problem: does not keep low revs. Completely.
We have:
a) the candle is new, it's a month old
b) there are no leaks - everything is covered
c) both filters are clean and passable for their media
d) fuel is supplied

You have to keep your hand on the trigger, put on the belt when the scythe is working and move around the garden with a rotating working body.
Not safe, however.

Alexey A. wrote:
You have to keep your hand on the trigger, put on the belt when the scythe is working and move around the garden with a rotating working body.
Not safe, however.

One to one is my problem. It seems that we are working with one oblique.

Started a week ago. The first time he asked his little son, he stepped on the gas, while dad put on the belt over his head ... Now I have adapted myself - I rest the lever on my leg above the knee. And I recommend you do the same.
In short, just as the Americans did not know how to make internal combustion engines, they did not learn. I made a mistake: the last thing I bought American-made where gasoline should be poured was this scythe.

Grenkin wrote:
In short, just as the Americans did not know how to make internal combustion engines, they did not learn

Is it okay that Henry Ford was American?

And your braid was collected in Mexico.

Andrey T. wrote:
Is it okay that Henry Ford was American?

It's not scary. Henry Ford, if you remember, did not come up with a car or even an engine for it. All he did was invent a conveyor belt. And I didn’t even come up with it. The conveyor was introduced before it. He was the first to make the industrial assembly line commercially successful. That is, it greatly reduced the cost of production and increased output. So no one argues against this, the Americans can do it.

Here is Karl Benz, Gottlieb Daimler, Wilhelm Maybach - yes, these guys are engineers from God. Current their passports are more and more German.

Andrey T. wrote:
And your braid was collected in Mexico.

This is your scythe harvested in Mexico, and mine was harvested in Hungary. The engine was actually assembled in Mexico. So what does that change? Whose brand is it on? MTD. Whose brand is MTD? That's right, American. So I do not care where it is collected, they answer. Do not trust, do not give your brand. Whirpool didn't trust Italian home appliance assemblers, so they build their Italian Whirpool under the Ignis brand. Volkswagen was in no hurry to make it a Volkswagen after buying the Czech Skoda. If you want a cheap Volkswagen, buy it, but Skoda. If you want a proven Volkswagen, buy it, but more expensive. And you want to say that these American MTDs bought some kind of Mexican factory for a low price and are now trying to snatch me their cheap Mexican products under their own (and at the price of their) brand? So I am about the same. Everywhere you go, the Americans still succeed in Henry Ford. Find out how to make cheaper and sell more

Possible faults and remedies - Operating instructions MTD L 09 2-stroke trimmer (790 M AST series)

Attention! The text in this document was automatically recognized. You can use the Original mode to view the original page.

POSSIBLE MALFUNCTIONS AND WAYS OF THEIR ELIMINATION

Cause
Empty fuel tank.
Empty fuel tank.
Manual fuel priming button was not pressed

enough times.

The carburetor overflows the fuel mixture.

Old or improperly prepared fuel

Defective spark plug.

Pour clean, fresh fuel mixture into the tank.
Pour clean, fresh fuel mixture into the tank.

Press the manual button all the way down

pumping fuel 10 times with a short break.
For products with air control lever
damper:

Press the throttle control lever

choke and pull the starter cable handle.
For products not equipped with a control lever
air damper:

Press the throttle control lever

shutter and pull the starter cable handle.
Drain the fuel mixture from the fuel tank. Fill in
a clean, fresh fuel mixture into the fuel tank.

Replace or clean spark plug.

Engine runs unstable at idle

Cause
Dirty air filter.
Old or improperly prepared fuel

Incorrect carburetor setting.

Remedies
Clean or replace the air filter.
Drain the fuel mixture from the fuel tank. Fill in
a clean, fresh fuel mixture into the fuel tank.
Contact an Authorized Service Center for
carburetor adjustment.

Engine is not picking up speed

Cause
Old or improperly prepared fuel

Incorrect carburetor setting.

Remedies
Drain the fuel mixture from the fuel tank. Fill in
a clean, fresh fuel mixture into the fuel tank.
Contact an Authorized Service Center for
carburetor adjustment.

The engine does not develop the required power or stalls

Cause
The presence of grass between the shaft and the working body.

Dirty air filter.
Old or improperly prepared fuel

Incorrect carburetor setting.

Remedies
Stop the engine and free the worker from the grass.
organ.
Clean or replace the air filter.
Drain the fuel mixture from the fuel tank. Fill in

a clean, fresh fuel mixture into the fuel tank.
Contact an Authorized Service Center for
carburetor adjustment.

Trimmer reel does not feed line

Cause
The presence of grass between the shaft and the working body.

There is no trimmer line in the reel.

The trimmer line is tangled on the bobbin.

The trimmer reel is dirty.

Trimmer line stuck together due to heat in the process

The trimmer line is twisted during winding.

Trimmer line is not released from the reel

Remedies
Stop the engine and free the worker from the grass.
organ.

Thread in new trimmer line.

Detangle the trimmer line or replace
bobbin.

Clean the bobbin and spool housing.

Remove the coil and remove the stuck together

Remove the spool, rewind the trimmer line.
Press down on the pressure head and pull out 10 cm.

For more information, contact an authorized service center in your area.

This manual is based on the latest information, illustrations and technical information available at the time of printing.

specifications. The manufacturer reserves the right to make any changes without prior

Click on the image to enlarge (will open in a new window)

1. Control handle.
2. Screw.
3. The upper part of the mount.
4. The middle part of the mount.
5. The lower part of the mount.
6. Screw.
7. Hook.
8. Cuff (depending on model).

Depending on model - Description of parts - Fig. 7-9.

1. Ez-Link ™ coupling.
2. Fixing button.
3. Clamping handle.
4. Lock button guide.
5. Hole in the sleeve.
6. Upper bar.
7. Lower bar.

Parts Description - Fig. 10-13.

1. Protective cover.
2. Screws.
3. Caliper.
4. Locking rod.
5. Shaft.
6. Shaft hub.
7. Hole in gear cup.
8. Hole in the shaft hub.
9. Trimmer line reel.
10. Locking washer.

Parts Description - Fig. 14-16.

Parts Description - Fig. 17-19.

1. Throttle control lever.
2. Throttle lever lock.
3. Ignition switch.
4. Manual fuel priming button (example).
5. Foot stop.
6. Starter rope.

Parts Description - Fig. 24-26.

Parts Description - Fig. 33-34.

Parts Description - Fig. 38-39.

Use the product for its intended purpose. The product is used:

• in accordance with the technical characteristics and taking into account the requirements of the safety regulations given in the Operation Manual;
• for work in the garden;
• for trimming the edges of the lawn, mowing grass in small areas and in hard-to-reach places, for example, under bushes;
• for mowing weeds and small bushes.

Using the product for any other purpose is a violation of the Operation Manual. The user is responsible for injury to unauthorized persons and damage to their property resulting from improper use of the product. Use only a product that is in good condition. The manufacturer is not responsible for damage caused by self-introduction of any changes in the design of the product.

When working with petrol trimmers.

Warning: Gasoline is highly flammable and its vapors are explosive. Therefore, observe the following precautions:

• Store the fuel mixture (gasoline with oil) only in special containers designed for storing chemically active substances.
• Do not create sources of ignition over spilled fuel mixture. Do not start the engine until the remaining fuel mixture has completely evaporated from its surface.
• Stop engine and allow to cool before refueling. Never open the fuel filler cap or add fuel mixture while the engine is running or hot. Do not operate the product without the fuel tank cap installed. Open the fuel tank cap carefully to equalize the pressure inside and outside the fuel tank.
• Prepare the fuel mixture and refill the fuel tank in a clean, well-ventilated area away from sparks and flames. After stopping the engine, slowly unscrew the fuel filler cap. Do not smoke when handling gasoline. Wipe off any spilled fuel mixture with a cloth before starting the engine.
• Before starting the engine, move the product at a distance of at least 10 m from the place of refueling. Do not smoke, keep away from sparks and flames.

Observe the directions given in the national / local government regulations for the time of day during which the product may be used (if necessary, contact the appropriate organization).

• Read this section carefully before using the product with a cutting blade.
• The control handle must always be between the user and the implement.
• Never lift the rotating cutting knife more than 76 cm above the ground.
• During operation, kickback may occur if the cutting blade comes into contact with solid foreign objects. In this case, loss of control of the product may occur. A bent or dull cutting blade contributes to kickback. In places that are difficult to view, such a situation is more likely to occur.
• When using a cutting blade, the thickness of the mowed grass or small bushes should not exceed 12.7 mm, otherwise a sharp kickback may be felt.
• Do not attempt to stop the rotating cutting blade.
• There is a risk of injury from the sharp surface of the cutting blade when rotating. Be extremely careful until the knife comes to a complete stop.
• Do not use high engine speed if you are not cutting.
• If the cutting knife accidentally hits a foreign object during operation, stop the engine immediately and check the product for damage. Re-start the engine only after all damage has been removed. Never use the product with bent, dull or cracked cutting blades. Replace a bent, deformed, cracked, or broken cutting blade with a new one.
• Do not sharpen the cutting knife. Sharpening the cutting blade can cause it to bend and become unbalanced. This could result in serious injury. Replace dull cutting knife.
• If excessive vibration occurs, stop the engine IMMEDIATELY. Excessive vibration is a sign of product malfunction.
  Check the presence and tightness of bolts and nuts before proceeding. Repair the product or replace defective parts as necessary.

• Use any household cleaners to clean the cutter blade of the product. Lubricate the cutting blade with machine oil to prevent rust.
• Store the cutting knife out of the reach of strangers.

• Do not store the product with a fuel mixture in a fuel tank in closed rooms, near sources of sparks and fire.
• Allow the engine to cool completely before storing and transporting. Secure the product securely during transport.
• Store the product in a dry, closed place out of the reach of unauthorized persons and children. Work outdoors only.
• Do not place the product in water or other liquid. Keep the grips clean and dry. Clean the product after each use (see section “Cleaning and storage”).
• Dispose of gasoline, oil, and other waste in accordance with local regulations.
• Retain this manual at all times when using the product. Refer to it as needed. Use the Guide to educate other users. When changing owner, hand over the Manual with the product.

Retain this manual at all times when using the product.

Stickers with various symbols (pictograms) are attached to the body of the product, the meaning of which is described in this section. Read the Operator's Manual and familiarize yourself with information on safety, assembly, operation, maintenance and repair.

The 1st Specialized Service Center "Agrotechservice" is ready to offer you a professional repair of the MTD 790 trimmer. Experienced, certified and qualified mechanics work in our company, performing all types of work in the field of maintenance and repair of garden equipment.

The MTD 790 gas cutter, which we often repair in our service, is a popular model among buyers due to the presence of an economical engine, an easy start system, and an ergonomic adjustable bar.

The main troubleshooting steps for this model of petrol cutters, identified when contacting our customer service center, are primarily associated with the failure and repair of the following unit components:

• repair of a starter on a trimmer MTD 790
• clutch repair on MTD 790 trimmer

In our service center, you can always carry out any repair and maintenance work, preparing your equipment for the upcoming season or ending its use during the seasonal period.

You can contact on the issue of repairs through the online application by filling out the form below or by phone in the contacts section.

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Quality spare parts. Obligatory delivery. Reliability.

We do not sell fake spare parts. The advantage of original spare parts is due to the fact that they are manufactured at the same factories as the spare parts that are supplied during production. We give a 100% guarantee that we will refund the money if the spare part is no longer supplied or discontinued.

Repair of petrol cutters MTD 790

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Channel on Zello-radio - "Doroshok service" go subscribe ask questions communicate.

I answer questions from 10-00 to 19-00 (sometimes rest is needed)))
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Recommend: 100%

Petrol trimmer MTD 790m - a device for the maintenance of small and medium-sized lawns, can be used in the garden for pruning branches, small shrubs, such as raspberries, as well as for thinning thickets of other thorny crops. The trimmer is triggered by the EZ pull system.

Engine parameters of MTD-790 brushcutters - two-stroke, engine brand Ryobi, motor power is 1 hp. or 800 watts. The device is ideal for light work in a short time. The trimmer is very compact and can be stored even in the smallest rooms.

The basic equipment of MTD 790 includes:

• barbell;
• lever;
• cutting part with a protective cover;
• fuel tank;
• engine;
• a document regulating the operation of mtd-790 petrol cutters;
• fastening parts;
• The trimmer is delivered unassembled in a cardboard box.

Trimmer Specifications:

• maximum number of revolutions per minute: 7000;
• engine cylinder volume 31 cc;
• fuel tank for 0.53 liters of gasoline;
• flexible drive shaft;
• straight, one-piece bar;
• two-stroke engine running on a mixture of engine oil and gasoline;
• comfortable D-shaped handle;
• the cutting part of the brushcutter is represented by a fishing line; it is also possible to change the fishing line with a four-toothed disc;
• overall dimensions of petrol cutters: 1100x300x320 mm;
• the weight of the brushcutter is 6.4 kg.

Due to its small size and light weight, the trimmer is convenient to store, transport and carry, it does not take up much space.

• Trimmer Plus system - allows you to quickly change the attachment, for example, remove the line and replace the cutting part with a hedge trimmer or lopper;
• quick start system of the engine - ast;
• electronic ignition;
• chrome-plated engine cylinder;
• vibration damping system (easier work with the brushcutter without fatigue);
• steel connecting rod and gas cutter shaft.

• use high quality fuel and oil, the ideal mixing ratio of oil and gasoline is 1:40;
• keep the device clean, clean the surface and the cutting part from grass after finishing work;
• do not leave the brushcutter in storage with a tank in which gasoline is left.

Advantages of MTD-790 790M:

• lightweight, compact, takes up little space;
• quick change of attachments without the use of tools;
• instant start thanks to the EZ pull system.

Disadvantages of MTD-790 790m:

• low power (suitable for light work for a short time);
• vibration during operation.