PTO power take-off shaft.
The effectiveness of the braking system and the absence of slipping depends solely on the spring device. The drive pulley is included in the transmission after the clutch mechanism, which allows you to stop the pulley by turning off the clutch mechanism without stopping the tractor engine.
When good fixation is observed, you need to remove the glass assembly.
Thus, the required shaft rotation speed is ensured regardless of the factor at which speed the tractor is driven, and whether the clutch is turned off or on.
The controls for a manual transmission with a mechanical or synchronized reduction gear are shown in the figure. Fixing the glass with your hand, smoothly unscrew the adjusting bolt 2.
Connect the rod to the lever using a cylindrical pin and pin it well.
There is an unclear fixation of lever 1 in extreme positions or when turning it on and off. knocking in the interval MTZ 80
See also: repair of the front axle MTZ-82 video
Independent and synchronous PTO drives "MTZ-82"
So, the design of the PTO of the MTZ-82 tractor is the same as that of the MTZ-80. The rear power take-off shaft of the MTZ-82 tractor is of a combined type. This means that the PTO can be equipped with both independent and dependent, that is, synchronous, drive. With an independent drive, the shaft rotation speed is determined by the rotation speed of the diesel engine, and with a dependent (synchronous) drive, it is determined by the speed of the tractor.
The independent PTO drive is connected directly to the engine flywheel. This ensures that the power take-off shaft rotates at a speed independent of the tractor speed. It will not affect the purity of rotation of the PTO and the engaged or disengaged clutch. The drive is independent - two-speed. It has two rotation speeds (540 or 1000 rpm), with a power unit speed of 2100 rpm.
The synchronous PTO drive is connected directly to the drive gear of the 2nd stage of the MTZ-82 gearbox gearbox. Therefore, the rotation speed of the power take-off shaft is tied to the speed of the tractor and is 3.5 revolutions for every meter of distance traveled by the tractor.
Switching to an independent or synchronous drive is carried out by a clutch moved using a leash located on the cabin floor. Namely: if the clutch driver is moved counterclockwise, then the synchronous drive is activated; if you turn it clockwise, the independent drive turns on. The middle position of the leash is “neutral”. In each of these positions, the shift clutch can be secured using a spring clamp.
The non-synchronous type should be started only when the engine is not running, or at the very minimum crankshaft speed. Synchronous - only on a tractor that is stopped.
The rotation speed of the power take-off shaft is standardized in certain values (540, 1000 rpm) specifically for correct operation with mounted and trailed equipment. Because otherwise, working on an additional device at an inappropriate speed can lead to either insufficient performance or damage to it.
When the independent drive is turned on, rotation from the internal drive shaft, which is located inside the secondary shaft of the gearbox, is transmitted through the shift clutch to the ring gear shaft of the PTO planetary gearbox.
When the synchronous drive is engaged, the clutch moves forward, disengaging from the internal shaft of the independent drive and connecting to the hub splines of the 2nd stage gearbox drive gear.
Power take-off shaft device "MTZ-82"
The housing of the rear axle of the MTZ-82 tractor houses a two-stage planetary gearbox of the power take-off shaft. It consists of a drive ring gear, three satellites and a sun gear. It is mounted on the carrier hub on a bronze bushing.
The satellites are fixed on the axles, which are pressed into the carrier bores. The splined hub of the carrier is rigidly connected to the shaft splines. And at the end of the PTO there are also splines for driving equipment and machines attached to the tractor. The power take-off shaft of the MTZ-82 tractor can be made in a composite form: when replaceable shanks with 8 splines or 21 splines are inserted into its rear edge. For machines and devices that use a rotation speed of 540 rpm, a shank of the first type is used, and for those machines where the rotation speed is 1000 rpm, a shank of the second type is used.
The difference in the standard sizes of splines on machines and units is made specifically in order to prevent possible confusion when choosing a speed mode
The shank is fixed on the shaft with a special retaining ring. The rotational energy is transmitted to the shank through four rollers.
Various standard sizes of splines on machines are made in order to prevent confusion in the choice of speed mode and breakdown of aggregated machines due to incorrect activation of the PTO speed.
The shaft is mounted on two ball bearings, the first of which is located in the bore of the ring gear shaft, the 2nd - in the cover attached to the rear wall of the rear axle housing. All parts that are installed on the shaft are tightened with a core nut.
Output of the rear PTO to the front linkage of the tractor.
To drive MTZ 82 equipment mounted on the front linkage, an additional set of parts and assemblies is used to output torque from the rear PTO.
The kit includes:
- An additional gearbox, which is attached to the rear PTO housing and converts rotation from the drive shank towards the front linkage under the rear axle housing.
- A system of brackets and fasteners for converting the rear linkage, providing space for mounting an additional gearbox.
- System of intermediate supports and fasteners for installing the cardan shaft.
- Cardan shaft transmitting rotation from the additional flange coupling. gearbox on the front linkage.
The kit parts are attached to standard holes on the transmission housing and frame of the MTZ 82 (80) tractor.
PTO control "MTZ-82"
The planetary gearbox of the power take-off shaft on the MTZ-82 is controlled by 2 band brakes. The first brake drum is welded to the carrier, the 2nd drum is connected via a splined coupling to the sun gear.
To turn on the MTZ-82 power take-off shaft, the control lever in the cab should be moved to the rearmost position. The brake on the sun gear drum is applied while the brake on the carrier is released.
From the ring gear, rotation is transmitted through the satellites to the carrier, and then from it directly to the shaft. The rotation speed decreases at this time according to the gear ratio of the planetary gearbox - by 1.47 times.
When you need to turn off the PTO gearbox, the control lever is moved to the extreme forward position. The brake on the sun gear drum is released, and the carrier brake is tightened. In this position, the carrier does not move, and the ring gear runs idle on the satellites. At the same time, the satellites rotate, also idle, the sun gear relative to the carrier hub.
The rotation speed of the power take-off shaft is switched by means of a clutch mounted on the shaft spline. The mechanism that does this is a hexagon located in the bottom cover of the one-piece clutch housing.
Maintenance of PTO "MTZ-82"
Maintenance of the power take-off shaft of the MTZ-82 tractor consists, first of all, of regular inspection of threaded connections and checking them, as well as periodic adjustment of the control mechanism. The PTO mechanisms, which are located in the rear axle housing, are lubricated with oil poured into the transmission.
The independent drive should be turned on at the minimum speed of the diesel engine. The synchronous drive is activated when the engine is running after engaging the gear, when the clutch mechanism is smoothly engaged.
During operation, it is necessary to periodically carefully monitor changes in the position of the PTO control lever, not allowing it to rest against the floor of the tractor cabin (as this will lead to slipping of the brake bands).
If the stroke of the control lever has increased, or the force on the lever has increased noticeably when moving it from the “on” to the “off” position, this indicates that adjustment is necessary.
The MTZ-82 power take-off shaft is adjusted according to the following plan:
- Setting the eccentric axis to its original position. The mark, which is specially applied to it, should be on the right side and located in a vertical position.
- Fixation of the installed position using locking plates.
- Traction disconnection. Unscrewing the bolts on the glass and releasing the spring.
- Removing the cover from the rear axle hatch to get to the head of the tension screw. Moving the lever to the neutral position and fixing it with a bolt.
- Removing the locking plate, tightening the screw until it stops. Screwing the thrust bolt into the outer glass. Move the lever to the “on” position. Installation of traction. Establishing the required lever play.
After the adjustment is completed, return all the parts to their places, strengthen the rods and fastening bolts with locknuts.
In the process of disassembling the cup, PTO with a compressed spring installed in it, it is important to be careful and perform all operations carefully, in a certain sequence. To disassemble and reassemble a glass with a compressed spring, it is best to use a press or clamp.
First stage
Bolt 16 is unscrewed, plate 17 is removed from the splined tail part on the axis. The bolt is securely fixed in the lever using a locknut.
The drive to the pulley and its location on the tractor are different and are determined by the layout of the main mechanisms of the tractor. For safety reasons, when turning out bolt 9, make sure that glass 7 is in constant contact with the seat until the spring is completely released. Adjusting bolts of the brake bands of the power take-off shaft 1 - adjusting bolts; 2 - rear axle housing Fig.
The power take-off shaft is turned off when the brake band 22 is tightened and 21 is released. The plate and bolt are installed in place.
Removing the MTZ claw coupling 1 - claw coupling; 2 - leash; 3 — differential; 4 — rear axle housing Fig.
Removing the hatch cover for adjusting the tension of the PTO brake bands: 1 - hatch; 2 - bolt. To normalize the situation, the eccentric is turned counterclockwise to its original position.
If this cannot be done, the entire structure is dismantled and labor-intensive repairs are carried out. PTO MTZ 80 82 types and features when purchasing. PTO repair
Common malfunctions that occur during PTO operation
- A fairly common problem when operating the MTZ-82 PTO is jamming of the shaft control lever, or difficult, with significant effort, control of the clutch driver. This occurs due to a malfunction of the reinforcement mechanism (spring cup), or wear of the claw coupling.
- Extraneous noises that are increasing, along with an increase in the transmitted torque, as well as traces of grease on the back cover indicate significant wear of the shaft splines, parts of the planetary gearbox, and possibly loss of elasticity or destruction of the cuffs.
- If the power take-off shaft is unusually noisy and jerky, then most likely the splined joints have become unusable. Or the teeth of the central gear have worn out (ground down). In this case, the shaft is pressed out and the condition of the gear is assessed. You will need to disconnect the rear axle and dog clutch. If a visual inspection shows significant gaps, or the gear moves completely freely, then the PTO requires serious repairs. After replacement, the shaft is mounted in place, and it must be adjusted.
- When the MTZ-82 tractor does not produce the required maximum power when working with attached equipment, the reason for this lies in the band brakes. They require appropriate adjustment or complete replacement. In cases where adjustment does not help to get rid of such a problem, there is a need to remove the PTO from the tractor and control the thickness of the brake bands. When the thickness has decreased to 2.5 millimeters and below, these worn bands are replaced with new ones.
- The PTO shaft moves too freely. This sign means that the tension on the locking nut has become loose. The power take-off shaft needs to be removed from the MTZ-82 tractor. The fixing nut must be tightened until it stops. And, if possible, restore the thread, or “cut a new one.”
- A visual inspection reveals significant oil leaks on the power take-off shaft cover. This is a common sign of a worn cuff or gasket. In such cases, the PTO of the MTZ-82 tractor must be dismantled and the gasket between the PTO cover and between the rear axle must be replaced. If a leak occurs from the shank side, then you need to remove the stopper ring, press out the shaft and replace the cuffs.
In all cases when, in order to correct malfunctions, the power take-off shaft needs to be separated from the tractor, to do this, you first need to unscrew the rear cover fastening bolts, and then press out the PTO assembly with technological bolts. After this, you need to remove the brake bands and check their thickness. As already indicated, the brake band requires replacement with a new one if its actual thickness is less than two and a half millimeters. Typically, significant wear of the brake bands is indicated by the continued rotation of the shaft end when the PTO is turned off, as well as by its uneven rotation.
In any cases where the speed reducer gearbox has been dismantled or dismantled, it is necessary to check or adjust the PTO. To do this, a jack is installed under the drive wheels of the MTZ-82 tractor. After which the power take-off shaft rotates, alternating engagement of various gears. When performing such an operation, the power take-off shaft of the MTZ-82 tractor must be switched to synchronous mode. While turning, the gear wheels should rotate freely.
Purpose of the tractor
First, the equipment is intended for work in the fields. Positioned on the market as a functional and all-wheel drive medium tractor. The tractor is capable of sowing, harvesting various crops, plowing plowed land and spring wedges. Often a tractor with attachments and trailers are used to move goods, for land and road work.
The mechanism can be removed without dismantling the fuel tank!!! In the video it is dismantled because others are planned.
Simplicity and reliability have earned the tractor great popularity
