90
Check the fixation of the torque arm brackets and studs. The torque arm stud nuts fastening
torque should be minimum 600 Nm (60 kgfm), if the hole for split pin does not coincide with nut
slots, fasten the nut and forelock it.
Rubber and metal linkages of the rear suspension torque arms doen’t need maintenance dur-
ing operation.
Repair and maintain shock absorbers in specialized workshops, keeping their cleanness.
Protect rod, servo cylinder and other part polished surfaces from scoring and other damages.
Fill the cylinder with damping fluid according to Lubricants and Hydraulic Fluids Charts. It
is forbidden to fill the shock absorber with fluid of any quantity and to use other fluids as operating
ones: when the fluid is not enough, the shock absorber does not generate forces, when there is excess
of fluid it can break.
When extending and contracting the shock absorber should offer uniform resistance. New
shock absorber force in rebound must be within 5.95-8.05 kN (595-805 kgf), during contraction -
1.52-2.28 kN (152-228 kgf); contraction and rebound force reduction for more than 25% during oper-
ation is forbidden. Force is measured on a press with the rod stroke of 100 mm and 100 rpm. Shock
absorber free play denotes its failure.
If there is liquid leakage from the shock absorber, fasten the nut of the shock absorber hous-
ing.
Shock absorber gap along the fixing stud or along its axle is forbidden. Change the shock
absorber bushings 10 (see Figure 67) and 13 (see Figure 70), if necessary. Fasten the shock absorber
retaining nut with 40 Nm torque (4 kgfm). If the split pin hole does not coincide, fasten the nut and
forelock it.
The truck can be equipped with shock absorber of various manufacturers (BAAZ, Bara-
novichy town, GZAA, Grodno city, PAAZ, Pervouralsk town), valve system construction and proper-
ties of them differ a little bit. That is why when changing shock absorbers, install shock absorbers of
one manufacturer (information on the manufacturer is marked on the lower part of the shock absorber
housing or casing).
4.3.3 Wheels and Tires
The truck is equipped with disc wheels of regulated pressure.
The wheel assembly includes: wheel valve 1 (see Figure 72), rim base assembly 2 with disc
and lock ring stop plate 3, lock 4 and bead 5 rings.
Structural feature of the wheel is toroidal seats ensuring secure tire mounting on the rim
along all air pressure regulation range. To provide wheel assembly and disassembly with tire on rim
base rim well is designed.
Wheels can have removable and non-removable safety shoulder on the side opposite to lock
part.
Summary of Contents for 4320M
Page 1: ...URAL 4320М TRUCK and its Modifications ...
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Page 177: ...Figure 140 Installation of left and right side safety devices 171 ...
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