The power take-off device is shown in fig. 1

The power take-off is bolted to the gearbox on the right side and serves to transfer power from the gearbox to the winch

It has two gears: for winding the cable onto the drum with a gear ratio (from the engine) of 2.41 and for unwinding the cable with a gear ratio (from the engine) of 1.7.

The power take-off is driven by the gear of the third gear of the intermediate shaft of the gearbox, with which the drive gear of the power take-off is in constant engagement.

The power take-off is controlled from the driver's seat with a lever.

The gears and bearings of the power take-off are lubricated with oil poured into the gearbox housing.

Design and repair of GAZ-66-car power take-off 02

Power take-off maintenance

Caring for the power take-off during operation consists in checking the condition of the fasteners and in carrying out a periodic change of lubricant.

When draining grease from the gearbox, also unscrew the drain plug of the power take-off.

Faults in the power take-off and how to fix them

The power take-off consists of the same parts as the gearbox, so faults and solutions will be the same as the gearbox.

However, special attention should be paid to some malfunctions in the power take-off. These include:

Excessive noise in the operation of the new gears. The cause of this defect may be the wrong center distance of the gears of the gearbox and power take-off.

Therefore, in case of replacing the gasket between the flange of the power take-off housing and the mating surface of the gearbox, make sure that the thickness of this gasket is 0.7-0.9 mm.

The correct thickness of the specified gasket ensures the required center distance of the gears of the gearbox and power take-off and their normal engagement.

Self-shutdown of the driven shaft gear block. This malfunction may be due to poor assembly of the assembly, which did not provide the required fit of the block on the driven shaft splines.

In this regard, when assembling the power take-off, you should carefully select the gear unit along the splines of the shaft.

Selection should ensure that there is no noticeable angular movement of the block when it slides freely along the splines of the driven shaft.

After selection, mark the location of the splines of the shaft and block.

If oil leaks through the shift rod stuffing box, tighten the stuffing box nut a little.

Power take-off repair

The power take-off is removed from the vehicle along with the gearbox.

Disassembling the box of the power take-off must be done in the following order.

  • 1. Disconnect the lower end of the control lever 1 from the stem 4 (see Fig. 1).
  • 2. Remove the control lever axle and lever, press the bushing out of the lever hole
  • 3. Press out the pin of fastening of the axis 13 of the drive gear, press out the axle, remove the drive gear 12 and support washers, remove the bearings of the drive gear.
  • 4. Remove the key from the driven shaft 9.
  • 5. Remove front cover 3 and gasket.
  • 6. Press the driven shaft oil seal out of the cover.
  • 7. Remove the back cover of 8 bearings.
  • 8. Take out the intermediate shaft 11, press out the front and rear bearings of the intermediate shaft gear unit.
  • Unscrew and unscrew the driven shaft nut, remove the driven shaft and gear assembly, press out the rear and front bearings of the driven shaft.
  • 9. Knock out the crankcase hatch plug.
  • 10. Remove the hole plug for the latch.
  • 11. Remove the stem protection cap.
  • 12. Remove stem 4. fork 7, retainer, spring, unscrew the stem nut, remove the ring, washer and stuffing box.

Assembly. Before assembling, lubricate all parts of the power take-off with oil poured into the assembly.

Smear the threaded part of the bolts with paint before setting. When assembling, use only new gaskets and seals.

The power take-off is assembled in the reverse order of disassembly, taking into account the following instructions.

Pick up a sliding block of gears along the splines of the driven shaft. The selection should ensure that there is no noticeable angular play when the block slides freely along the shaft.

Angular backlash on the splines should not exceed 0.08 mm when checked on the radius of the initial circle of the crown with the number of teeth equal to 24.

Introduce the sliding block of gears into the internal cavity of the crankcase so that the ring gear with straight teeth yami was located on the side of the hole for the latch, and the gear shift fork entered the groove of the gear block.

Install the rear bearings of the intermediate and driven shafts flush with the plane of the crankcase.

Press the inner rings of the ball bearings of the driven and intermediate shafts to the stop into the ends of the shoulders on the shafts. At the same time, the probe 003 mm should not pass between the ends of the collars and rings.

The driven shaft bearing fastening nut, which is completely screwed up, should be screwed into the groove of the shaft.

After installing the rubber gland, metal washer and felt ring on the stem, tighten the gland nut until it turns tight.

Before installation, lubricate the working surface of the output shaft seal.

Press the oil seal into the front cover flush with the outer end of the cover.

Put a plug into the crankcase groove on the SK-OTsB paste.

Press the stem plug into the hole for the locking ball flush with the crankcase wall.

Press the pinion shaft into the crankcase flush with the boss plane. Align the hole in the axle and the crankcase boss.

Before setting the axis, grease the holes in the crankcase with SK-OTsB paste. Press the axle mounting pin flush with the end face of the boss.

Press the sleeve into the hole in the power take-off control lever until the end of the sleeve stops against the outer end of the lever.

Put the assembled power take-off on the stand and test it without noise load, oil leakage and ease of shifting.

Fill the power take-off with spindle oil before testing.

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