6.3. Gearbox: 1 – back cover; 2 – gearbox housing; 3 – filler plug; 4 – clutch release fork; 5 – clutch housing; 6 – speed sensor; 7 – gearbox control lever; 8 – gear selection rod; 9 – gear shift lever; 10 – gear shift mechanism; 11 - breather; 12 – Reverse light switch
Renault Logan cars are equipped with mechanical five-speed gearboxes (figure 6.3). With K7J engine (working volume 1.4 l) they are installing a JH1 gearbox with a K7M engine (working volume 1.6 l) – JH3. Both gearboxes are practically identical in design and differ only in the dimensions of the clutch housings. The gear ratios (Table 6.1) of both gearboxes are the same.
Table 6.1 Gearbox ratios
6.4. Gearbox identification data: 1 – gearbox type; 2 – gearbox modification; 3 – serial number of the gearbox; 4 – manufacturer's code
Information is located on the website [renaultbook]
The identification data of the gearbox is stamped on the lower part of its housing. The decoding of the identification data is shown in Figure 6.4.
The gearbox is made according to a two-shaft scheme with five synchronized forward gears. The gearbox and the main gear with the differential have a common housing. The clutch housing is attached to the front part of the gearbox housing. A stamped steel cover is installed on the rear part of the gearbox housing.
The primary shaft contains a 5th gear pinion with a synchronizer rotating on a needle bearing, and the drive pinions of the 1st, 2nd, 3rd and 4th gears are made as a single unit with the primary shaft.
The secondary shaft is manufactured together with the main transmission drive gear; in addition, freely rotating driven gears of the 1st, 2nd, 3rd and 4th gears are installed on the shaft, and the driven gear of the 5th gear is fixed on the shaft splines.
Forward gears are engaged by axial movement of the clutches of two synchronizers of I–II and III–IV gears, installed on the secondary shaft, and the clutch of the synchronizer of V gear, installed on the primary shaft. Gear shift mechanism 10 (see figure 6.3) located in the cover installed on top of the 2nd gearbox housing.
6.5. Gearbox control drive: 1 – gearbox control drive rod mounting clamp; 2 – gearbox control drive rod; 3 – gearbox control lever; 4, 6 – nuts; 5 – gearbox control lever linkage; 7 – washer
The gearbox control drive consists of a linkage 5 (figure 6.5) gear shift lever 3 with a ball joint secured to the body base with nuts 4, rods 2 of the gearbox control drive and mechanism 10 (see figure 6.3), mounted on the gearbox housing.
The main transmission is made in the form of a pair of cylindrical gears, selected for noise. Torque is transmitted from the driven gear of the main transmission to the differential and then to the front wheel drives.
The differential is bevel, with two satellites. The tightness of the connection of the inner joint of the right front wheel drive with the differential gear is ensured by a seal pressed into the gearbox housing, and the inner joint of the left drive is ensured by a seal installed in the joint cover. The cover of the inner joint of the left drive is fixedly secured by a special holder on the gearbox housing, and the drive shaft rotates inside the cover on a ball bearing.
At the bottom of the gearbox housing there is a drain plug, and on the side there is a filler plug 3.
Gearbox repair requires a large set of special tools and appropriate training of the performer, so this section only covers the removal and installation of the gearbox, replacement of its seals and repair of the drive. If you need to repair the gearbox, contact a specialized service.
The procedure for changing the oil in the gearbox is described in Section 4 "Maintenance" (cm. "Checking the level and adding oil to the gearbox").