Disassemble/assemble front spring

AR32.20-B-0201E

Disassemble/assemble front spring

22.07.2020

Model

979.2

1

Complete front spring (comprising three leaves)

10

Metal shim

2

Adapters (eyelets) of the master leaf for bushings housing

11

Pads of high density polyethylene

3

Articulation bushings installed in the adapters

12

Clamp riveted on the third leaf

4

Spring king-screw

13

Clamp closing screw

5

King-screw's self-locking nut

14

Clamp closing screw self-locking nut

6

Upper and lower metal separators

15

Clamp's distance bushing

7

Front spring master leaf

A

Free length of the springs

8

Second leaf

B

Length to the spring master screw

9

Third disc



Disassemble

1

Remove the springs from the vehicle

AR32.20-B-0211A

Total "A" length of the front axle springs

*BE32.20-B-1001-01C

2

Secure the spring in a vise with protection jaws and, at the spring rear end, remove from the clamp (12) the self-locking nut (14), the closing screw (13) and the spacer bushing (15)

3

Remove the master screw self-locking nut (5) and the spring master screw (4)

 Insert a long pin in place of the spring master screw (4) to remove the metal shim (10), the leaves (7), (8), and (9) and the metal separators (6).

4

Remove the metal shim (10), the master leaf (7) and the upper metal separator (6)

5

Remove from the ends of the second leaf (8) the polyethylene pads (11)

6

Remove the second leaf (8) and the lower metal separator (6)

7

Remove from the ends of the third leaf (9) the polyethylene inserts (11)

8

Remove the third leaf (9)



Check

9

Thoroughly clean all the spring components

 Do not wash spring leaves with water jets nor with acid. Dry clean the blades.
If oxidation occurs, remove it with a fine wire brush and apply adequate protection.

 The original springs are painted with zinc based paint.

 Spring leaves cannot be welded nor ground under any circumstance.

10

Inspect the spring leaves and other components for their condition

Thickness of the metallic separator placed between the discs

*BE32.20-B-1003-01C

Master screw (dowel pin) nominal diameter

*BE32.20-B-1004-01C

Master blade thickness

*BE32.20-B-1005-01C

Thickness of the second disc

*BE32.20-B-1006-01C

Thickness of third blade

*BE32.20-B-1007-01C

Thickness of the high-density polyethylene pads between discs

*BE32.20-B-1008-01C

Thickness of the shim assembled at the upper part of the front axle master disc

*BE32.20-B-1009-01C

Replace:



Dented or deformed leaves;

Deformed clamps;

Self-locking nut for the master screw (5) and the self-locking nut for the clamp closing screw (14).



Assemble

11

Replace the joint bushings (3) of the adapters of the master leaf (2) and the shackle.

 Utilize an appropriate mandrel and a shop press.

 Installation: Center the bushings (3) in relation to the adapters edges (2).

12

Install new polyethylene inserts (11) on the third blade (9) and the lower metal separator (6)

 Installation: Check that the polyethylene pads (11) are perfectly seated.

 Grease the entire surface of the spring leaf (9) and the metal separator (6).

Grease, 6820.20

*BR00.45-Z-1109-06A

13

Install the second leaf (8), the new polyethylene inserts (11) and the upper metal separator (6)

 Installation: Check that the polyethylene pads (11) are perfectly seated.

 Grease the entire surface of the spring leaf (8) and the metal separator (6).

Grease, 6820.20

*BR00.45-Z-1109-06A

14

Install the master leaf (7) with the adapter (2) inside the circle of the second leaf (8) and mount the metal shim (10)

 Use as guide a pin of the same diameter of the king-screw (4), that can be secured in a vise to permit that the spring pack be assembled standing, i.e, in the working position.

15

Fit the spacer bushing (15), a new clamp closing screw (13) and a new self-locking nut (14) on the riveted clamp on the fourth blade (12)

 Lock nut of the front crossbow clamp

*BA32.20-B-1003-01C

16

Install the master screw (4) and tighten the self-locking nut on the master screw (5)

 If necessary, secure the master screw head (4) in a vise.
Protect the jaws with copper or aluminum plates.

Total height of the front axle assembled springs and with the master pin tightened

*BE32.20-B-1010-01C

 Master screw (spikes) of the front crossbow

*BA32.20-B-1002-01C

17

Remove the excess lubricating grease of the leaves (7), (8) and (9)

18

Install the front springs on the vehicle

AR32.20-B-0211A

Front axle suspension vehicles LO 979.2

Number

Designation

Model 979.2
With shock absorbers fixed with nuts and washers at the upper part and bushings at the lower part

Model 979.276/277
With shock absorbers fixed with upper and lower bushings

BE32.20-B-1001-01C

Total "A" length of the front axle springs

Under normal load

mm

1600  3

1600  3

Front axle suspension vehicles LO 979.2

Number

Designation

Model 979.2
With shock absorbers fixed with nuts and washers at the upper part and bushings at the lower part

Model 979.276/277
With shock absorbers fixed with upper and lower bushings

BE32.20-B-1003-01C

Thickness of the metallic separator placed between the discs

In the central part

mm

1

1

Front axle suspension vehicles LO 979.2

Number

Designation

Model 979.2
With shock absorbers fixed with nuts and washers at the upper part and bushings at the lower part

Model 979.276/277
With shock absorbers fixed with upper and lower bushings

BE32.20-B-1004-01C

Master screw (dowel pin) nominal diameter

mm

10

10

Front axle suspension vehicles LO 979.2

Number

Designation

Model 979.2
With shock absorbers fixed with nuts and washers at the upper part and bushings at the lower part

Model 979.276/277
With shock absorbers fixed with upper and lower bushings

BE32.20-B-1005-01C

Master blade thickness

In the central part

mm

18,5

18,5

Front axle suspension vehicles LO 979.2

Number

Designation

Model 979.2
With shock absorbers fixed with nuts and washers at the upper part and bushings at the lower part

Model 979.276/277
With shock absorbers fixed with upper and lower bushings

BE32.20-B-1006-01C

Thickness of the second disc

In the central part

mm

18,5

18,5

Front axle suspension vehicles LO 979.2

Number

Designation

Model 979.2
With shock absorbers fixed with nuts and washers at the upper part and bushings at the lower part

Model 979.276/277
With shock absorbers fixed with upper and lower bushings

BE32.20-B-1007-01C

Thickness of third blade

In the central part

mm

18,5

18,5

Front axle suspension vehicles LO 979.2

Number

Designation

Model 979.2
With shock absorbers fixed with nuts and washers at the upper part and bushings at the lower part

Model 979.276/277
With shock absorbers fixed with upper and lower bushings

BE32.20-B-1008-01C

Thickness of the high-density polyethylene pads between discs

At the edges

mm

6

6

Front axle suspension vehicles LO 979.2

Number

Designation

Model 979.2
With shock absorbers fixed with nuts and washers at the upper part and bushings at the lower part

Model 979.276/277
With shock absorbers fixed with upper and lower bushings

BE32.20-B-1009-01C

Thickness of the shim assembled at the upper part of the front axle master disc

In the central part

mm

3

3

Front axle suspension vehicles LO 979.2

Number

Designation

Model 979.2
With shock absorbers fixed with nuts and washers at the upper part and bushings at the lower part

Model 979.276/277
With shock absorbers fixed with upper and lower bushings

BE32.20-B-1010-01C

Total height of the front axle assembled springs and with the master pin tightened

Reference measurement in center

mm

60,5

60,5

 Metallic suspension on the front axle

Number

Designation

Type 685.203, 979.0/2

BA32.20-B-1002-01C

Master screw (spikes) of the front crossbow

M10x1,5

Nm

42

 Metallic suspension on the front axle

Number

Designation

Type 685.203, 979.0/2

BA32.20-B-1003-01C

Lock nut of the front crossbow clamp

M8x1,25

Nm

22...24

Repair materials

Number

Designation

Order number

BR00.45-Z-1109-06A

Grease, 6820.20

Use corresponding commercially available repair materials.