67
Towing device servicing includes cleaning and lubricating. Lubricate the drawnhook
stem guides through oil fillers during vehicle maintenance operations.
Axial displacement of the hook in the housing should not exceed 0.5 mm. To ensure it
tighten nut 1 until a clearance is formed between housing 2 and pressure ring 3 due to elastic
element’s 4 deformation (to be determined by free displacement of the towing hook). Then,
unscrew the nut until eliminating axial displacement of the hook and lock it with retaining
strip and bolt. Retaining strip 10 together with bolt 11 turned into its hole and the hook rod
may move within amount of clearances in the connection
элемента
4.
Fit locking cotter pin 8 when operating the truck with trailer.
Truck operation with trailer without the retaining strip 10 and with unsecured latch
of the towing hook by the locking cotter pin 8 is not admissible.
When operating the truck with the trailer check the wear of hook (jaw) working surface.
Allowable limit wear of the jaw should be Ø 58 mm max (Ø 48+1,9 mm for the new towing
hook). It is prohibited to tow the trailer having the towing loop with working area section of 43.9
mm.
5.3.2 Truck Suspension
5.3.2.1 The truck front suspension (Fig.48) consists of two longitudinal parabolic
springs 2 that work jointly with hydraulic telescopic bilateral shock absorbers 8. Upper shock ab-
sorbers eyes are attached to brackets 7 (attached to the frame girders) through rubber sleeve pipes
10. Lower shock absorbers eyes are attached to brackets 18 welded to the axle beam.
Springs are fixed in the middle part on the axle beam with U-bolts 3 on the axle housing.
The axle upstroke is limited by the rubber bump stops 5 fixed in the spring lining 4. The axle
downstroke is limited by the third deflected spring plate ends with the drawbar fixture screws 15
of the rear spring plates supporting brackets which have the spacers 16.
Eyes 25 are secured onto the spring front ends by means of U-bolts 19 and bolts 27.
Through the eye the springs are connected with front brackets 1 by pins 22, which are locked
in the brackets by wedges 26 The spring rear ends enter freely the eyes of rear brackets 8.
Depending on the front axle load of the truck there can be used the front springs which
blades differ in their thickness; in this case the front spring U-bolts and other fixture parts are not
changed.
