How to disassemble and assemble a manual gearbox? What are the steps to disassemble and assemble a m

Disassembly and assembly of manual transmissions.

Manual transmission.

Disassembly and assembly steps: disassemble the five-gear gear cover (reverse gear switch, odometer line); Fix the bolts on the reverse shaft, remove the two flanged shafts, remove the shift shaft, and tighten the transmission housing and press the bolts diagonally.

The cross method is loosened and removed; Remove the transmission housing; Remove the differential.

Remove the final reduction gear and reverse gear; Remove the fork; Remove the input and output shafts. The transmission is assembled and restored in the reverse order in which it is disassembled.

The precautions for disassembling and assembling the manual transmission are as follows:

1. When disassembling and assembling, you should pay attention to safety.

2. Use tools correctly and strictly follow the order of disassembly and assembly.

3. Each shaft should be in the neutral position during assembly.

4. When assembling the input shaft, output shaft, main reduction gear shaft and main reducer, pay attention to the pure tightness of the bearing pre-imitation.

5. When loading the transmission housing, pay attention to the sealing of the contact surface.

6. After assembling the transmission control mechanism, the operation should be light and flexible, and the locking mechanism can work.

The structure of the transmission: The transmission is mainly composed of three aspects: the shell, the control mechanism and the transmission part.

Photo by Lai Choi Ying) @2019

The car needs to be disassembledGearboxFirst of all, you need to use a 13mm sleeve to unscrew the bolt of the rear cover of the gearbox, remove the back cover and sealing ring of the gearbox, and then remove the locking device and synchronizer of the car, as well as the gears of the car.

First, the dismantling and assembly of the gearbox:

Prepare tools and boxes for all kinds of parts, and disassemble them on a clean and flat worktop. If you do not have a maintenance manual for the car, you should have a notebook and a marked strip of tape ready.

Disassembly should start from the front oil pump, from front to back, from the outside and inside, and keep a record at any time.

Automatic transmission.

The shell is mostly made of aluminum alloy, and when disassembling, it is strictly forbidden to use a crowbar.

and iron tools directly struck.

When disassembling the hydraulic valve body, you should be careful and careful, and when the upper and lower valve bodies are separated, you should prevent the balls, snap rings, etc. from falling to the ground, and remember the correct position accurately.

Dismantle and inspect the one-way clutch.

, it is necessary to pay attention to its correct assembly direction, and when it is assembled, it must not be reversed.

After the parts are disassembled, they should be washed with gasoline and dried with low-pressure compressed air.

Padding an O-ring.

In principle, the wearing parts should be replaced with new parts after disassembly, and the wearing parts that are deformed and worn should not be reused.

The new clutch pads and brake pads should be soaked in the transmission oil and can only be installed after absorbing enough oil.

When the valve core, piston, seal, etc. are assembled, they should be coated with transmission oil.

When assembling, tighten the screws in strict accordance with the specified torque.

The reasons for this are as follows:

1) The clutch is not completely disengaged and cannot completely cut off the power. The specific performance is two aspects of rubber beating: one is due to improper operation, the pedal is not stepped to the end, resulting in incomplete separation and difficulty in mounting.

This phenomenon is common in novices, due to unskilledness, often the pedal is not stepped to the end and the gear is in gear, and the gear is not in gear; the second is the difficulty of hanging gear caused by the poor technical state of the clutch;

2) The tooth ends of individual meshing teeth of the new car are rough, which makes it difficult to hang the gear;

3) The shift fork is loose and bent, the shift fork shaft is bent and corroded, and it is difficult to move, and when the locking screw of the fork shaft fixing the fork is loose, it will also cause difficulty in hanging the gear;

4) The length of the reverse gear lever on the gear lever is improperly adjusted, and when the reverse gear is hung, the rising height of the Liang Zhengxiang lock plate is not enough, and it cannot smoothly enter the reverse gear position.

The above content reference: Encyclopedia - Gearbox.

1. Stipulate the transmission, clamp the disassembly tool on the vise, fix the transmission on the disassembly tool at the same time, use the 13mm sleeve to unscrew the bolt of the back cover of the transmission, and remove the back cover and sealing ring of the transmission.

2. Use a 4mm cylinder to punch out the five-speed shift fork to lock the elastic pin, and then use the circlip to remove the snap ring.

3. Take out the 5-speed shift fork and synchronizer upward, and then take out the 5-speed passive gear.

4. Use a tool to remove the snap ring on the 5-speed driving gear, and remove the disc-shaped elastic washer, and then use the puller to remove the 5-speed driving gear.

5. After the locking device is disassembled, then disassemble the bearing locking piece, the method is: use the pattern sleeve of T40 to unscrew the bearing locking piece bolt, and then insert it into the bolt hole of the locking card with a cylinder of appropriate size, and remove the locking card with another cylinder rushing to the other end of the outer top.

6. Disassemble the transmission housing. The method is: unscrew the reverse switch counterclockwise, remove the bolt with a 13mm sleeve, and use a pry bar to carefully pry upwards to separate the transmission housing from the clutch housing.

7. Remove the reverse gear shaft, take out the reverse gear sliding wheel teeth outward, and then press down and hold the reverse gear fork to remove the reverse gear fork pin.

8. Disassemble the transmission gear set, the method is: hang 2 gears first, then punch out the groove pin with a 4mm cylinder, take out the rod shaft assembly and the bearing oil seal outward, then take out the gear selection return spring, take out the locking switch assembly of the interlocking device outward, drag the 1 axis, 2 shafts together with the fork and take it out vertically.

9. Disassemble the differential by using the T50 pattern sleeve to unscrew 11 bolts, pry open the bearing seat with two pry bars, take out the magnet, and then take out the differential, locking pin and locking spring upward.

Step 1: Disassemble the five-gear gear cover, pull out the five-gear gear and synchronizer bushing.

Step 2: Fix the bolts of the reverse gear shaft, remove the two flange shafts, remove the shift shaft, loosen and remove the transmission housing fastening bolts according to the diagonal cross method, pry the transmission housing carefully upward, and remove the transmission housing.

Take the front wheel drive of a car as an example, first loosen the front wheel tire wire, remove the battery wire, the screw fixed on the cylinder block on the gearbox, start the machine, and then frame the car, remove the tires, put gear oil, and remove the half shaft. Remove the screws that hold the bottom half in place. I removed the gearbox and finished it.

The process of disassembling and assembling the manual transmission is easy to do step by step.

It doesn't matter, what matters is the result, and the result is important.

Although the torque converter can transmit and increase the engine torque, the torque conversion ratio is not large, and the transmission range is not wide, which is far from meeting the needs of the automobile working conditions. In order to further increase the torque, expand its transmission range, and improve the adaptability of the car, an auxiliary transmission is installed behind the torque converter, and the planetary gear mechanism is mostly used.

The planetary gear transmission is composed of a planetary gear mechanism and actuators such as clutches, brakes and one-way clutches. A planetary gear mechanism usually consists of multiple planetary rows. The number of planets is related to the number of gears.

The shift actuators of planetary transmissions include shift clutches, shift brakes, and one-way discs.

Extended Materials. The manual gearbox is mainly composed of gears and shafts, and the variable speed and torque are generated through different gear combinations; The automatic transmission AT is composed of a hydraulic torque converter, planetary gears and a hydraulic control system, which achieves variable torque through hydraulic transmission and gear combination.

Among them, the hydraulic torque converter is the most characteristic component of the AT, which is composed of pump wheels, turbines and guide wheels, etc., which directly input the engine power to transmit torque and separation.

The pump wheel and the turbine wheel are a pair of working combinations, they are like two fans placed opposite each other, the wind from one active fan will drive the blades of the other passive fan to rotate, and the flowing air - wind becomes the medium of kinetic energy transfer.

If the liquid is used instead of air as the medium to transfer kinetic energy, the pump wheel will drive the turbine to rotate through the liquid, and then add a guide wheel between the pump wheel and the turbine to improve the transfer efficiency of the liquid. Due to the torque converter automatic variable speed torque range is not large enough and the efficiency is low.

20 points to ask for this? It's a car's transmission, right? Estimate that you out of 200 may someone willing to teach you live.

Manual transmission.

(schematic) of the disassembly and assembly steps

Repair the transmission.

Clamp the removal tool to the vise.

and secure the transmission to a disassembly tool or table. Unscrew the transmission back cover bolt with a 13mm sleeve and remove the transmission back cover and sealing ring.

Step 2: Remove the locking device.

Dismantle the five-speed synchronizer and gears;

with a 4 mm cylinder.

Flush out the locking elastic pin of the five-speed shift fork.

Remove the snap ring with circlip pliers.

Remove the five-speed shift fork and synchronizer upwards, then remove the five-speed driven gear.

Use a tool to remove the snap ring on the fifth-speed drive gear, remove the disc-shaped elastic washer, and then use a pull tool to remove the fifth-speed drive gear.

Step 3: Remove the bearing locking:

Use the T40 pattern sleeve to loosen the bearing locking bolt.

Insert a cylinder of suitable size into the bolt hole of the lock card, and use another cylinder to punch to the other end of the outer top cover to remove the lock card.

Step 4: Remove the transmission housing:

Loosen the reverse switch counterclockwise;

Remove the bolts with a 13 mm sleeve (1 short stud, 3 long studs, 1 long bolt and 11 short bolts).

with a crowbar. Carefully pry up to detach the transmission housing from the clutch housing.

Step 5: Disassemble the reverse gear shaft and gear:

Remove the reverse shaft directly.

Take out the reverse sliding gear outward.

Remove the reverse shift fork:

Depress the reverse shift fork first, then remove the reverse shift fork pin outwards to remove the reverse shift fork.

Step 6: Disassemble the transmission gear set:

Place it in 2nd gear first, and then punch out the grooved pin with a 4mm cylinder.

Remove the oil seals of the shaft assembly and bracket.

Take out the 1st and 2nd gear selector return springs.

Remove the locking switch assembly of the interlock.

Hold axes 1 and 2 with a fork and remove them vertically.

Step 7: Remove the differential.

Unscrew 11 bolts with a T50 type sleeve.

Use two crowbars to pry the housing outward.

As shown in the figure below, remove the magnet.

Take out the differential upwards.

Remove the locking pin and locking spring.

Manual gearbox disassembly and assembly steps:

2. Remove the transmission hanger. Cross, split the bolt of the transmission housing in three parts. Remove the sealing screws.

Open the snap ring, place it on the countershaft bearing, and then remove it with a circlip plier. Finally, pull out the transmission housing and dowel pins. Remove the reverse idler shaft, reverse idler, and the rest is like a reverse fork.

Remove the backshift lock cam;

3. Wrap adhesive tape on the spline of the clutch driven disc to remove the shift fork assembly, spindle assembly and countershaft assembly from the clutch shell. Remove the differential assembly, magnets, drain plates, oil deflectors, and gaskets.

The process of disassembling and assembling the manual transmission is as follows:

1. The first step: disassemble the five-speed gear cover, pull out the five-gear gear and synchronizer bushing;

2. The second step: fix the bolts of the reverse shaft, remove the two flange shafts, remove the shift shaft, loosen and remove the fastening bolts of the transmission housing according to the diagonal crossing method, pry the transmission housing carefully upward, and remove the transmission housing;

3. The third step of the first Jiwang: take out the differential group front numberer;

4. Step 4: Remove the main reduction gear and the reverse gear;

5. Step 5: Remove the fork and remove the input shaft and output shaft.