Marzocchi MXC Coil User manual

MXC
Coil
INSTRUCTIONS
GENERAL RULES
1. Where specified, assemble and disas-
semble the shock absorption system us-
ing the M ARZOCCHI special tools only.
2. On reassembling the suspension system,
always use new seals.
3. Clean all metal parts with a special,
preferably biodegradable solvent, such
as trichloroethane or trichloroethylene.
4. Before reassembling, lubricate all parts
in contact with each other using silicone
fat spray or a specific oil for seals.
5. Always grease the lip seal rings before
reassembling.
6. Use wrenches with metric size only.
Wrenches with inch size might damage
the fastening devices even when their
size is similar to that of the wrenches in
metric size.

MXC
Coil
FAILURES, CAUSES AND REMEDIES
This paragraph reports some failures that may occur when using the fork. It also indicates possible causes and suggests a remedy. Always
refer to this table before doing any repair work.
Oil leaking through the bottom of slider O-rings at pumping rod bottom damaged Replace the O-ring
Oil leaking though the top of slider 1. Oil seal is worn out
2. Stanchion tube is scored
3. Excessive dirt on oil seal
1. Replace oil seal
2. Replace crown/stanchions assembly, oil
seals and dust seals
3. Clean the oil seal seat and replace oil
seal
Fork has not been used for some time and
is locked out
Oil seals and dust seals tend to stick to
stanchions
Raise dust seal and lubricate stanchion
tube, dust seal and oil seal
Excessive play of stanchions in the sliders Pilot bushings are worn Replace pilot bushings
FAILURES CAUSES REMEDIES
The fork reaches its end of stroke easily Valve at the bottom of the stanchion
damaged
Change
Adjuster position does not affect fork opera-
tion
Dirt inside legs Clean carefully and change oil
Fork rebounds too fast in any adjuster
position
Dirt inside fork legs Clean carefully and change oil

MXC
Coil
RECOMMENDATIONS FOR
MAINTENANCE
M ARZOCCHI forks are based on advanced
technology, supported by year-long experi-
ence in the field of professional mountain
biking. In order to achieve best results, we
recommend to check and clean the area
below the dust seal and the stanchion tube
after each use and lubricate with silicone
oil.
In general, M ARZOCCHI forks can offer top
performance from the start. However, in
some cases a short running-in period is
required (5-10 hours) for inner adjustments.
This running-in period will make fork life
longer and ensure fork top performance
over time.
IMPORTANT: change oil at least every
100 working hours.
Polished forks should be cleaned with
bodywork polish at regular intervals in
order to preserve their original finish.
INSTALLATION
Installing the fork on a bicycle is a very
delicate operation that should be carried
out with extreme care. The installation should
always be checked by one of our Technical
Service Centers.
WARNING: Steer tube/headset
mounting and adjustment must be
carried out in compliance with the headset
manufacturer’s instructions. Improper in-
stallation may jeopardize the safety of the
rider.
To replace it, contact one of our Technical
Service Centers with the required tools.
WARNING: In case of improper
installation of the steer tube into the
crown, the rider might lose control of his/
her bicycle, thus jeopardizing his/her safety.
DISC BRAKE SYSTEM ASSEMBLY
If a disc brake system is installed, it is
possible to replace original brake supports
fixing pins with screws (part no.
532979QF) available as spare parts.
Tighten the above screws to 10 Nm.
Assembling the brake caliper onto the slider
is a very delicate operation that should be
carried out with extreme care.
Improper assembly might overstress the
caliper supports which might break.
When installing the disc brake system, be
sure to properly follow the instructions given
by the manufacturer.

MXC
Coil
2
5
4
7
REBOUND ADJUSTMENT VIA
INNER PUMPING ROD
The adjuster controlling REBOUND damp-
ing adjustment is accommodated inside
pumping rod (10) inside each fork leg.
To access the adjuster, unscrew the top cap
(5) and push the stanchions fully down (see
section DISASSEMBLY, Fig. 1).
Fit the supplied hexagon rod (C) into the
stanchion tube and into the adjuster inner
hole. Rotate the adjuster clockwise for harder
damping, counterclockwise to soften it.
Refit the cap (5) and tighten it to the
specified torque (see section REASSEM-
BLY, Fig. 24).
IMPORTANT: Do not remove the springs
or this will alter the amount of oil inside the
fork legs.
ADJUSTMENT
SPRING PRELOAD
Take off the rubber protection (2).
To change preload, turn the screw (4)
inside cap (5) using a 4 mm Allen wrench.
Turn out the screw (4) completely, then
tighten it until it touches the upper washer
(7). From this starting position, which cor-
responds to “0” preload, turn in as many
turns as the preload you want. Each turn
corresponds to 1.25 mm.
When supplied, the fork is set to the mini-
mum preload. However, spring is slightly
preloaded to counteract static loads. By
turning the adjustment screw clockwise, the
preload is increased up to the maximum
value equal to 15 mm’s of spring preload.
This adjustment is essential in order to have
the right fork response for the rider’s weight
and riding style.
C
10

MXC
Coil
DISASSEMBLY
GENERAL
– The reference numbers given in this section relate to the components shown in the fork exploded view.
– Before starting any operation. please read the diagram below. It shows the quickest procedure and the exact disassembling sequence.
Locate the part you need to remove in the diagram, then look at the arrows to determine which other parts you need to remove first.
DISASSEMBLY DIAGRAM
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▲
▲
▲
▲
▲
▲
▲
▲
▲
▲
▲
▲
▲
▲
▲
▲
▲
FORK LEG OIL CHANGE
PUMPING ROD CHANGE
FOOT NUT FIG. 3
SPRING FIG. 2
DUST SEAL FIG. 5
STOP RING. 6
OIL SEAL FIG. 7
FOOT BUFFER FIG. 10
PUMPING ROD FIG. 10
REBOUND SPRING FIG. 10
PILOT BUSHING AND SEAL
ASSEMBLY CHANGE
STANCHION TUBE CAP FIG. 1
CROWN AND STANCHIONS
ASSEMBLY FIG. 4
SPRING CHANGE
VALVE ASSEMBLY CHANGE
STOP RING FIG. 11
UPPER WASHER FIG. 8
PILOT BUSHING FIG. 9
VALVE ASSEMBLY FIG. 11

MXC
Coil
SPRING CHANGE
FIG. 1
Unscrew the caps (5) with a 21 mm socket
wrench.
Remove the caps complete with O-ring (6)
from the stanchions.
FIG. 2
Push the stanchions into the sliders and
remove the lower washer (7) and the
spring (8) from each fork leg.
Drain all oil from the fork legs.
WARNING: Remember to always
recycle any used oil.
To change the fork leg oil follow the proce-
dure as described in section “REASSEM-
BLY” from Fig. 22 to Fig. 24.
PILOT BUSHING AND SEAL
ASSEMBLY CHANGE
FIG. 3
Turn the fork leg upside-down and unscrew
the foot nuts (21) by the use of a 15 mm
socket wrench.
.
5
6
8
7
21

MXC
Coil
FIG. 4
Withdraw the crown and stanchions as-
sembly (1) from the sliders (20).
FIG. 5
Remove the dust seal (15) from the top of
the sliders using a small screwdriver.
FIG. 6
Remove the stop ring (16) from the sliders
by placing the screwdriver bit in one of the
three openings on the stop ring.
IMPORTANT: when removing the stop
ring, make sure not to damage its seat.
1
20
15
16

MXC
Coil
FIG. 7
Fit the slider protector (A) onto the slider
and remove the oil seal (17) with the help
of a large screwdriver.
IMPORTANT: when removing the oil seal,
make sure not to damage its seat. Once
removed the oil seals should not be used
again.
FIG. 8
Remove the upper washer (18) from the
slider.
FIG. 9
Fit the bit of a small screwdriver into upper
edge slot of the pilot bushing (19) and lift
gently. Pull the bushing out of the slider and
make all necessary changes.
17
A
18
19

MXC
Coil
PUMPING ROD CHANGE
FIG. 10
Remove the foot buffer (21) complete with
O-ring (23) from the pumping rod ends
(10).
Withdraw the pumping elements (10) and
the rebound springs (11) from the stan-
chion tube top.
CAUTION: model with a travel of 80 fit
two rebound springs (11) for every pump-
ing element.
Replace the seal ring (9) if damaged or
worn out.
VALVE ASSEMBLY CHANGE
FIG. 11
To check that the valve assembly is operat-
ing correctly, it is necessary to work on the
inside of the stanchion tube.
Slip off the stop ring (13) using pointed
pliers.
Pull the valve assembly out of the tube with
one finger in the same sequence as in the
figure: covering (36), valve (35) and
washer (12).
2123 10
(100) (80)
910
9
11
13
36 35 12

MXC
Coil
REASSEMBLY
CAUTION: before reassembling, all metal
components should be washed carefully
with inflammable, preferably biodegrad-
able, solvent and dried with compressed
air.
PILOT BUSHING AND SEAL
ASSEMBLY
FIG. 12
Check that no dirt or debris is between
slider and bushing. Insert the pilot bushing
(19) into place so that it adheres to the
slider.
FIG. 13
Fit the upper washer (18) into the slider so
that it touches the pilot bushing.
FIG. 14
Lubricate the oil seal (17) and place it onto
the seal press (B) with the hollow side
toward the slider.
Press the oil seal until it touches the lower
washer by using the above seal press.
19
18
17
B

MXC
Coil
FIG. 15
Insert the stop ring (16) into the slider
making sure it is properly seated into place.
Use buffer (B) to properly seat the ring into
the slider.
FIG. 16
Lubricate the dust seals (15) and fit them
into the stanchions from the spring end.
VALVE AND PUMPING ROD
ASSEMBLY
FIG. 17
After having overhauled or replaced the
valve unit and after having cleaned the
inside of the tube, reassemble.
Assemble valve components, in correct
sequence: washer (12), valve (35) and
covering (36).
Then fit seal ring (10) on pumping element
(9).
In pumping element fitted to forks with a
travel of 100, only fit one rebound
spring (11), or two rebound springs (11)
for a travel of 80.
Insert the complete pumping element in the
valve assembly.
16
15
11
10
9
(80) (100)
11
10
9
36
35
12

MXC
Coil
FIG. 18
Lubricate the O-rings (22) and (23) and
reassemble the foot buffer (14) onto pump-
ing element end (10).
23
14 10
22
FIG. 19
Insert pumping rod just assembled in the
stanchion, bring valve assembly (D) fully
home in the stanchion.
Refit the stop ring (13).
CROWN AND STANCHIONS
ASSEMBLY
FIG. 20
Fit the crown and stanchions assembly (1)
- with the dust seals in place - gently into the
sliders seals.
WARNING: to avoid any damages
to sealing surfaces, keep the
stanchions duly lubricated and squared
into the sliders.
Press the crown and stanchions assembly
fully down and check that threaded ends of
pumping elements (10) are coming out
through the bottom of the sliders.
Check to see that the stanchions slide unre-
stricted by cycling the fork up and down
several times.
The tube should slide freely inside the seal
assembly without any side play. In the event
it is too hard or too soft, repeat the previous
steps described above and check compo-
nents to ensure they are not damaged.
Seat the dust seals (15) on top of the
sliders.
13
D
D
(100)
(80)
1
15 15

MXC
Coil
FIG. 21
Screw the foot nut (21) on the pumping rod
threaded end (10).
Tighten to 11 Nm.
Check to verify that the stanchions slide
properly through the stroke by pumping
them up and down several times.
Nm11
21
HOW TO FILL WITH OIL
FIG. 22
Pour oil little by little when the stanchions
are fully down and then pump with the
crown so as to have a better filling.
Check that the oil level (H) is as required in
both legs.
SPRING AND CAP
FIG. 23
Fit the spring (8) and washer (7) into each
stanchion tube.
H
Travel (mm) H (mm)
80 25
100 45
8
7

MXC
Coil
FIG. 24
Lubricate the O-ring (6) on the cap (5).
Turn the preload adjuster (4) inside the cap
until setting minimum preload (see section
ADJUSTMENT).
Start the complete cap assembly into the
stanchion tube thread by hand. Tighten the
cap (5) to 20 Nm.
Set spring preload as specified in section
ADJUSTMENT.
Nm20
5
6