Chapter 1 – General information / Technical specifications
Service Manual AJP PR3/PR4 1 - 31
Spring length (no load)
480mm
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Length of the springs (installed w / preload)
470mm
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Spring constant
40N/mm (4,1Kgf/mm)
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Dimensions of the fork springs
Ø34,5x480x25,6mm
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Springs preload bushing
Ø
40x65mm (nylon)
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Spring preload
10mm
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Oil seals retainers of the forks
40x52x10,6
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Seals dust scrapers
40x52,5x4,9x14
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Retaining ring of the seals
Ø 41,2x51,6x3mm
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Holding bridle of the seals (rectangular)
Ø55,5x51,6x1,3mm
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Fork cover
M45x1,25 (hexagonal 30mm)
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O-ring of the fork cover
40x3,5
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Fork cover torque
2,5Kgf,m
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Hydraulic cartridge tube
Ø
28x350mm
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Rod / piston of the hydraulic cartridge
M12x1
Ø
12x590 (aluminum)
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M12x1 adjustment nut on the rod end
27mm of the tip top
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Hydraulic adjustment rod
Ø
5x577mm (aluminum)
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Distance sleeve on the rod
Ø
25x120x12mm
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Regulation of the preload adjusting nut
10mm away from the nylon
bushing
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Lower fixation screw
DIN 912 – M10x30
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Lower sealing ring
Ø
10x16x1,5 (copper)
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Recommended oil
AGIP FORK SAE 10W
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Fork oil capacity (each fork)
430ml
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Fork adjustment
Left fork
Compression (+ C -)
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Right fork
Return/extension (+ R -)
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Standard regulation
MARZOCCHI USD 40
Return
2 Turns (Since all tight)
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Compression
2 Turns (Since all tight)
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PR4 Special edition
SACHS 48mm
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Type
Up side down
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Forks of the fork
Ø
48mm
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Tubes of the outer forks
670x59xx54
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Maximum warping of the tubes / forks fork
-
0,2
Spring length (no load)
461mm
438,1mm
Springs preload
4mm
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Springs constant
K = 42N/mm (4,3Kgf/mm)
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Springs dimensions
Ø 43,5x461x33,5
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