Technical characteristics of the ZIL-5301 gearbox

ZIL vehicles and their modifications are equipped with a mechanical five-speed gearbox with synchronizers (Fig. 1).

Gearbox: 1 - primary shaft: 2, 21, 30 and 45 - bearings; 3, 28, 31 and 47 - retaining rings; 4 - primary shaft rear bearing cover; 5 - fourth and fifth gear synchronizer; 6 - fourth gear pinion sleeve; 7 and 40 - fourth gear pair; 8 and 38 - third gear pair; 9 - first and reverse gear shift rod head; 10 - second and third gear shift fork; 11 - gearbox cover; 12 - mounting sleeve; 13 - detent ball; 14 - detent spring; 15 - gear shift rod locking device pin; 16 - locking device ball; 17 - second and third gear synchronizer; 18 and 34 - second gear pair; 19 - first and reverse gear shift fork; 20 - first and reverse gear toothed wheel; 22 - speedometer drive worm; 23 and 59 - speedometer drive gears; 24 - secondary shaft bearing cover; 25 - flange with reflector; 26 - secondary shaft flange nut; 27 and 51 - seals; 29 - intermediate shaft nut; 32 - gearbox housing; 33 - secondary shaft; 35, 39 and 41 thrust washers; 36 and 42 - lock rings; 37 - intermediate shaft reverse gear wheel; 43 - intermediate shaft; 44 - constant mesh gear; 46 - plug; 48 - gasket; 49 - locking pin; 50 and 53 - roller bearings; 52 - lock plate; 54 and 67 - springs; 55 - reverse gear wheel block axle; 56 - reverse gear wheel block; 57 - inspection and filler plug; 58 - power take-off hatch cover; 60 - drain plug with magnet; 61 - breather; 62 - first gear and reverse gear disengagement fuse; 63 - intermediate lever shaft; 64 - gearshift lever tip housing; 65 - lever lock; 66 - gearshift lever boot; 68 - gearshift lever tip; 69 - intermediate lever; 70 - intermediate lever cracker; 71 - first gear and reverse gear shift rod; 72 - fourth and fifth gear shift rod; 73 - second and third gear shift rod; 74 - speedometer drive shaft nipple; 75 - gearshift lever; 76 - key

The use of synchronizers in the gearbox makes it easier to control the car, ensures silent gear shifting and increases the durability of the gear clutches.

It should be borne in mind that the gearboxes are equipped with a worm 22 and a gear 59 of the speedometer drive, designed for a certain gear ratio in the rear axle.

Type of gearbox mechanical with five gears for moving forward and one backward

Gear ratios:

  • - first gear 6.45
  • - second gear 3.56
  • - third gear 1.98
  • - fourth gear 1.275.
  • - fifth gear 1.00 (direct)
  • - rear stroke 6.15

Maximum torque transmitted to the gearbox, Nm 410

Gear shifting is mechanical, with a rocker arm mounted on the gearbox cover

Power take-off. From the reverse gear block

Maximum power of the power take-off, kW (hp) 22.08 (30)

Possible gearbox malfunctions

Cause of malfunction - Method of elimination

Difficult to engage all gears, reverse gear and first gear engage with a grinding noise

Incomplete disengagement of the clutch (the clutch "leads") - Adjust the free play of the clutch release bearing sleeve

Engagement of gears with impact and grinding

Worn conical rings of synchronizers or locking chamfers of fingers and carriage - Replace synchronizers

Self-disengagement of gears on the move

Incomplete engagement of gears due to a malfunction of the shift mechanism, wear of the fork grooves or loosening of the fork fastening and levers - Fix faults, replace worn parts

Gears do not engage

Destruction of bearings of driven shaft gears, broken pins or synchronizer locks - Replace faulty parts - Replace synchronizers

Increased noise level during gearbox operation

Worn or broken gear teeth. Destruction of bearings - Replace faulty parts.

Oil leak from gearbox

Worn seals or loss of elasticity

Increased pressure in gearbox crankcase, leakage along sealing surfaces - Replace seals

Flush breather. Tighten fasteners, replace gaskets