Why the second gear is flying out on the power tiller Neva?
Types of infringements in the gearbox and ways to fix them
If the automatic transmission mechanism ceases to function normally, the following types of problems may occur:
- Kinematic coupling inside the gearbox interrupted.
- Spontaneous disengagement of gears or lack of engagement.
- Oil leak on the shift shaft.
- Malfunction of the axle shaft decoupling mechanism.
- No gear shifting.
- Gearbox is stuck.
Kinematic coupling problems within the gearbox or a broken sprocket in the unit will require disassembly to replace the problem sprocket. Excessive oil in the gearbox can be the cause of an oil leak on the change-over shaft, therefore have the oil level checked. If the welding seam of the pinion is broken, the shaft block must be disassembled and replaced. After draining the excess oil, check the oil seal for wear on the shift shaft, disassemble the gearbox and replace the part.
The reason of not fixing or spontaneous gear disengagement is a violation of the adjustment mechanism of gears. When making repairs, loosen the screws that secure the shifting mechanism board.
After that turn on the first gear and tighten the screws fixing the board. For example, making a minitractor with their own hands, it is necessary to monitor the correctness of the adjustment of the drive, changing the tension of the cable to control the separation of the half axles. To fix a broken half axle separation actuator inside the gearbox, disassemble the gearbox and replace the broken parts.
If you find a broken spring or worn out shift change plate retainers, replace the damaged parts and readjust the gear shift. If it is missing, it may be destroyed dry shifting or cut a threaded piece of the shift knob. After disassembling the gearbox it will be necessary to replace the defective parts. If there is no shifting, disassemble the gearbox and replace the worn shift fork. If a broken chain caused the gearbox to jam, disassemble it and replace the chain.
If the gearbox is noisy due to insufficient oil in the gearbox, or if the quality of the lubricant does not meet the required parameters. Always choose the proper oil grade and cleanliness. If there are any problems, you will need to do an oil change or refill the gearbox.
Noise in your powerpack transmission may be caused by loose fasteners, so check and tighten them properly.
Frequent noises are caused by worn gears and bearings. This can cause more serious damage to your powerpack’s gearbox. It is easy to avoid them if you do timely inspection and repair of your power tiller. It consists in the usual replacement of worn components and parts.
If there is a heating of the components of the transmission of a motor-block, the following main causes of this malfunction are distinguished:
There can be two reasons for correcting the deficiencies:
In order for a gearbox or homemade gearbox to last longer, you should periodically check the oil level in it, beware of sudden changes in load.
Signs of irregularities associated with difficulties in shifting gears, spontaneous disengagement, violation of the process of turning on the unit, arise from the following reasons:
Scuffing (wear) of the pinion faces causes two problems, resulting in self-switching or incomplete speed engagements.
Adjusting the plow of the “Neva MB-2″ motoblock
The plow is attached to the bed from behind by an adapter or coupling. Soil carriers are lifted to the ploughing depth by means of supports without tilting. Vertical tine is adjusted. It maintains verticality when the plow board touches the ground for the next 30mm of heel lift.
Adjust the angle of repositioning: place the shoe under the left turnbuckle and raise the plough leg. Tighten connections, finished. The handle bars are at waist level. less strain on the arms and shoulders.
Setting up the Neva MB-2 plough
Plow is hitched to tractor bed with rear yoke or hitch. Soil carriers are lifted to the ploughing depth with no tilting. Stand is upright. It maintains verticality when the field board rests on the ground for the subsequent 30 mm heel lift.
Setting the angle of repositioning: a shoe is put under the left hook and the plough leg is set in a vertical position. Tighten the joints, done. Keep the tiller arms at waist level. less strain on your arms and shoulders.
Types of faults in gearboxes and how to fix them
If the automatic transmission mechanism ceases to function normally, the following types of malfunctions may occur:
- Kinematic coupling inside the gearbox is disturbed.
- Spontaneous or loose gear shifting.
- Oil leaking from the shift shaft.
- Disruption of the axle-half disengagement mechanism.
- No gear shifting.
- Gearbox is stuck.
If there is a kinematic malfunction inside the gearbox or if the sprocket in the unit breaks, disassemble the gearbox to replace the problematic sprocket. Excessive oil in the gearbox can be the cause of a leaky shift shaft, check the oil level. If the welding seam of the pinion is broken, disassemble the gearbox and change the shaft block. After draining the excess oil, check the oil seal for wear on the change-over shaft, disassemble the gearbox and replace the part.
Failure to lock or spontaneous disengagement of gears is due to misalignment of the gear shift mechanism. Doing the repair, you should loosen the screws fixing the switching mechanism board.
Then engage the first gear and tighten the board locking screws. For example, having made a minitractor with their own hands, it is necessary to monitor the correctness of the drive, changing the tension of the cable to control the separation of the half axles. To fix a breakage of some element of the drive half-axle separation inside the gearbox, you should disassemble the gearbox, replacing the broken parts.
If you find a broken spring or worn shift change-over plate retainers, replace the damaged parts by adjusting the shift. If it is missing, it may be destroyed dry shift or cut off a threaded piece of the shift knob. After disassembling the gearbox it will be necessary to replace the defective parts. If the gear shift does not change over you should disassemble the gearbox and change the worn shift fork. If a chain breakage is the cause of the jamming, the chain must be disassembled and replaced.
If there is excessive gearbox noise, it may be caused by insufficient oil in the gearbox or by the lubricant not meeting the required quality parameters. The oils must be of the proper brand and of the proper purity. If there are any problems, the oil needs to be changed or topped up in the gearbox.
Noise in the transmission components of your power tiller may be caused by loose fasteners, so you need to inspect the fasteners and make sure they are properly tightened.
Frequent noise is caused by worn gears and bearings. This can cause more serious damage to the gearbox of your power tiller. Avoiding them is not difficult if you do timely inspection and repair of your power tiller. It consists in ordinary replacement of worn out assemblies and details.
If there is heating of power train components on your power tiller, there are the following main reasons for this malfunction:
There may be two reasons for correcting the deficiencies:
For a gearbox or homemade gearbox to last longer, you should periodically do a check of the oil level in it, for fear of sudden changes in load.
Signs of malfunctions due to difficulties in shifting gears, spontaneous switching off, malfunctioning of the unit are due to the following reasons:
Burrs (wear) in the faces of the engageable gears cause two kinds of problems, resulting in selfshutdown or incomplete speed engagement.
Changing the oil in the engine
Procedure for the engine oil change procedure:
- Install the vehicle on a flat surface.
- Let the engine cool down. It helps to measure the oil level.
- Clean the area around the dipstick plug, which is on the left side of the engine.
- Fill up the oil to the maximum mark (recommended oil is TAD-17I, TAP-15V).
- To determine the level to which the fuel has been filled, use a dipstick. To do this you need to take a dry dipstick and put it in the oil filler plug. Any residual trace can indicate to what level the fuel has been filled.
- If there is too much oil, the engine starts to leak and may cause malfunctions.
Initial start-up and running-in
A precondition for the running-in period is that all parts should have a chance to run in. After a short period of operation at a minimum load level, the single axle tractor will break down less frequently in the future.
- The run-in period should be at least as long as that specified in the owner’s manual.
- Stresses should be kept low. For example, if the maximum cutting depth is stipulated in the technical data but only 50 cm when starting up and running in, it is advisable to allow 30 cm for the first time.
- Fill the engine with oil before the running-in period.
- Fill the fuel tank.
- Run the machine at medium speed.
- Check that all the gears work within 60 minutes.
- Carry out light-duty cultivating, plowing and transporting small loads.
First run-in and running-in
The running-in period is necessary so that all parts can run in. The single axle tractor is less likely to malfunction after short periods of operation at minimum load.
- The break-in time should be at least as long as specified in the operating manual.
- Loads should be small. For example, if the technical data says that the maximum working depth is 50 cm, it is advised to work only 30 cm during the first run-in.
- Fill the engine with oil before the running-in period.
- Fill the fuel tank.
- Start the machine at a medium rpm.
- All gears should be checked within 60 minutes.
- Tillage, plowing and transporting small loads with little effort.
How to reduce the speed of a power tiller
Some models may be too fast for certain tasks (ploughing in heavy soils and virgin land); if so, you must reduce the speed.
Without modifying the machine, you can use a reduction gear on many models. This option lets you reduce speed without reducing power, so you can work the ground more thoroughly.
Reduce speed by reducing wheel diameter or replacing gears in the wheel gearbox. Usually installed gears of different sizes, with the number of teeth 61 and 12, to reduce the speed, you must replace them so that the number of teeth on the larger sprocket increased.
How to make a mini-tractor from the “Neva” motoblock with your own hands, photos and drawings
It is not always a pleasure to work on the property. Most people try to mechanize this difficult physical work, acquiring power tillers, cultivators or minitractors.
Some craftsmen, after working with a power tiller, decide to make a mini-tractor from the “Neva” power tiller with their own hands.
To facilitate the task, you can buy a special adapter with a seat, thanks to which a single-axle tractor will turn into a four-wheeled helper.
(Update) Craftsman rear tine tiller repair. stuck gears
Making a mini-tractor from a “Neva” power tiller with our own hands
Making a mini-tractor from the “Neva” with your own hands, you will minimize time and effort, which will result in the appearance of an excellent device to do all the work on the homestead. In addition to the adapter you can buy: plough, hoe, harrow and other accessories.
You can also upgrade a single axle tractor into a mini tractor with their own hands from unused parts of other equipment. This re-equipment option will take more time, but it will pay off inexpensively.
To create a mini-tractor from the motor-block “Neva” the following components will be required: the single-axle tractor itself, metal pipes, angles, sheets; two wheels; a welding machine; a seat for the driver; a set of tools.
The step-by-step process of modernizing a power tiller into a mini-tractor
- We develop the design of the kinematic scheme. The main thing in this scheme is the balance of design, so that additional loads will not destroy the future equipment. This scheme is developed by yourself, or you can use the ready-made scheme, with a kinematic image of the mini-tractor.
- Making a frame from angles and pipes. When making the frame, it is important to think about the location of the fork and bushing that allow the trailer to turn.
- We make the body. For the body an excellent manufacturing material will be a steel sheet. The height of the sides of the body should not exceed 30 cm.
- Let’s install the driver’s seat.
- Mounting attachments.
- Check the performance of the manufactured mini-tractor.
One such option, to create a mini-tractor, we will consider on the example of the motor-block “Neva MB-2s 7.0 PRO”. This tractor is equipped with a Subaru EX 21D engine.
If you carry out plowing of the garden plot with this snow thrower, it will be difficult to straighten up within a week. In order to avoid such consequences, we convert the single-axle tractor into a mini-tractor.
Since the SUBARU engine has no 12v output, the lights are installed for decoration. To make them work, you need to install a battery pack or a battery.
The imperfection and inconvenience of this technique is not noticed when plowing the land. This tractor was tested on heavy plowing land.
Although the tractor’s pulling power characteristics were questioned during its creation, the tests were very successful.
Also a big plus of this machine is that the driver and the front of the mini-tractor are an additional load, which helps the drive wheels to grip the ground better.
Levers set up: throttle lever on the right, half axle release lever on the left. To lift the hitch, a sprocket, 150 mm in diameter, is used.
Hooked by bicycle chain on lever or hand-operated jack.
Original “Volga” wheels, found in a junkyard, were previously cleaned of rust and painted. The pedal arrangement is similar to car pedals: the right pedal is the brake, the left pedal is the clutch. Speeds are shifted with the lever. Brakes taken from the moped “Riga-7” are installed.
The principle of the clutch pedal is the same as that of the power tiller: when you press it, the minitractor drives, if you release it, it stops. Left armrest lever has a cable that unlocks the axles.
It is used when turning is required. There are no special details for turning to the right or to the left. The gas lever is located in the right armrest. The linkage lifting lever is located under the seat.
Wear of the drive belt on the gearbox is the same as on a power tiller.
The sum of driver’s weight and tractor front weight is 100-110 kg, which prevents the front of the mini-tractor from lifting when ploughing.
The size of cultivated track is the same as on the power tiller. 630 mm. Stability problems occur if the ploughing goes deeper than 20 cm.