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ROCK
JUDY
c
T
D
Y
SERVICE MANUAL
For Judy XC, SL, DH and FSX Forks
RockShox, Inc.
I .800.6//./1/1

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INTRODUCTION
ROCK SHOX JUDYS— The Judys are designed as a modular system. The multicellular urathane
(MCU) springs and damper cartridge are easy to tune, remove and replace. With the adjustment available
almost any ride quality can be achieved.
Steerer Tube
Preload Adjuster Knob
Fork Crown Bolts (2/side, none on SL)
Fork Crown
Upper Fork Tube (w/ dust boot)
Fork Brace
Fork Brace Bolt
Brake Post
Lower Tube
Hollow Shaft Bolt (all)
Shaft Bolt (hollow on DH model only)
REQUIRED TOOLS
COMMON HAND TOOLS:
• 2, 4 & 5mm hex keys
• Snap ring pliers
• Small straight blade screwdriver
• Soft face mallet
• Safety glasses
SPECIAL ROCK SHOX TOOLS:
• Bushing installer tool
• Bushing remover tool
• Judy bushing puller adapter ring
• Mag seal puller tool
• Cartridge Service Tool Kit
Shaft Guide Tool
MISCELLANEOUS:
• High quality bearing grease
(Judy Butter or Non-Lithium)
• Fishing line or Mag 21 Seal O-ring
• RockShox Fork Oil (8 or 5 wt.)
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REGULAR MAINTENANCE
1. Routine maintenance of Judy forks consists of keeping the forks clean externally. After every ride,
wipe down the outside of the fork.
2. Approximately once a month and/or every 40 hours of riding, inspect the fork for damage (crown,
brace, upper tubes, lower tubes.)
3. Also check the torque of the crown bolts, lower tube bolts, brace bolts and brake posts.
4. The aluminum upper tubes, the MCU spring stacks, and the bushings in the lower tubes should be
lubed at this interval.
REMOVING MCLI STACKS
1.
2.
3.
.4
Figure 2A
Figure 2B
REMOVING
1.
2.
Figure 2D
3.
Figure 2E
To lube MCIJ spring assembly, first loosen the 5 or 6mm crown bolts
using a 4 or 5mm allen wrench respectively, then unscrew top cap
assembly counter-clockwise and pull top cap and MCU spring stack
out (fig. 2A and 2B).
Unsnap the MCIJ springs and/or spacers from the Judy Jax and clean
off old grease with a rag and degreaser such as Pedro’s (fig. 2C).
Now reassemble the stack and, using a rag or your fingers, apply a
coating of grease to the entire MCIJ spring stack. Reassemble by
screwing top cap assembly back into upper tube and tighten crown
bolts to 60 in/lbs of torque (very snug but not super tight).
Figure 2C
AND GREASING LOWER TUBES
To lube upper tubes and bushings the lower tube/brace assembly must
be removed. first, disconnect front brake cable and remove front wheel.
Using a 5mm hex wrench, remove 6mm bolt at bottom of each lower
tube. See fig. 2D. It may be necessary to add preload to the spring
stack in order to break the 6mm bolt loose. Add preload by turning
the adjuster knobs clockwise and/or compress the fork.
After removing both 6mm bolts, pull lower tube/brace assembly free of
upper tubes. See fig. 2E.
4. Use a clean, lint-free rag and degreaser to clean the aluminum upper
tubes. Clean bushing surfaces inside magnesium lower tube with a
clean, lint-free rag. Be certain to reach lower bushings (cont. next page )
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REMOVING
Figure 3A
AND GREASING LOWER TUBES (Cont.)
located 7″ inside lower tube (a long 3/8″ drive extension or screwdriver works
well for this).
5.
Apply a light coating of grease such as Judy Butter to the clean bushings
(again, a long 3/8″ extension without the rag this time works well for lower
bushings). See fig. 3A.
NOTE: DO NOT USE LITHIUM-BASED GREASE.
6. Next, apply a light coating of grease to upper tubes (Fig. 3B) and internal lip
of dust wiper located on top of each lower tube (Fig. 3C). The primary cause
for a sticky Judy is a dry and/or dirty dust seal rubbing on a dry and/or dirty
upper tube.
REINSTALLING THE LOWER TUBES
Figure 3D
1. Slide lower tube/brace assembly gently over upper tubes, taking care
not to damage dust wiper or lower bushing. (Fig. 3D)
2. Apply medium threadlock such as blue Loctite 242 to threads of 6mm
bolts and, using a 5mm allen key, reinstall them through the lower tubes,
engaging threads in cartridge and/or neutral shafts.
3. Torque to 60in/lbs. If bolts do not thread into cartridge and/or neutral
shafts, check to see if upper tubes have engaged lower bushings. It may be necessary to spread
lower tube/brace assembly apart slightly or gently rock assembly side to side while getting lower
bushings to mate with upper tubes. DO NOT FORCE. Be sure to push protective boots into their
retaining grooves on the lower tubes.
TUNING VARIABLES
Judy forks can be tuned to your particular weight, riding style and terrain. Start by tuning the spring stack
to achieve the correct ride height. (Please refer to the illustration in the back as a reference for the parts
used in the following descriptions.)
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RIDE HEIGHT ADJUSTMENT
Judys are designed to compress (droop or sag) when you are sitting with your weight on the bike. Sag
allows the front wheel to stay in contact with the ground when braking and cornering over rough and
uneven terrain. Adjust preload and/or change spring stack to maintain correct ride height. For example,
set preload adjusters to zero (full counter-clockwise) and sit on the bike. If fork compresses 15mm (too
much sag), turn preload adjusters clockwise, one click on each side at a time, until desired ride height is
achieved. The nominal sag dimensions are: 7-10mm for 75 and 80mm travel; 5-8mm for 60mm travel;
2-5mm for 50mm travel.
SPRING TUNING
To tune the MCU spring, unscrew
the top cap assembly (see
exploded view in Small Parts
Catalog or Owner’s Manual)
Remove spring stack. By using
different combinations of the soft
(red), the firm (blue) springs, and
the solid spacer, almost any spring
200
0 150
100
E 50
o
A = 5 firm/ I solid
= 6 firm
B
= 5 firm/ Isoh
C
D = 4 firm/2 soft
= 3 firm/3 soft
E
15
30
45
TRAVEL (MM)
figure 4A
60
D
75
rate you desire is possible. Simply separate the standard springs from
the JUDY JAXTM, then reassemble the new combination of firm and soft springs you would like to try.
SPRING PRELOAD
The preload adjuster knobs control the amount of fork sag (preload on the spring stack).
Turn the adjuster knob clockwise to increase the preload on the microcellular spring and reduce sag.
Turn the adjuster knob counter-clockwise to reduce the preload on the spring and increase sag.
COMPRESSION DAMPER TUNING
A single cartridge in the left leg provides the damping for the entire fork( except the DH.) Kits with
different travel options (2″/50mm adjustable, 2.5″/60mm adjustable, and 3″/75mm adjustable are
available for XC and SL models only). The DH is available in 80mm adjustable only. The damper unit has
a wide range of adjustment. Insert the enclosed 2mm hex key through the hollow shaft bolt in the
bottom of the left leg (see exploded view at end of English section.) Turn the hex key clockwise to
increase the compression damping. Turning the hex key counterclockwise will decrease the compression
damping. There are two full turns of adjustment available from full clockwise. DO NOT TURN ADJUSTER
MORE THAN TWO FULL TURNS COUNTER-CLOCKWISE.
REBOUND DAMPER TUNING (DH only)
A cartridge in the right leg provides the rebound damping for the DH fork. The damper unit has a wide
range of adjustment. Insert the enclosed 2mm hex key through the hollow shaft bolt in the bottom of the
right leg (see exploded view at end of English section.) Turn the hex key clockwise to increase the
rebound damping (slow the return stroke.) Turning the hex key counterclockwise will decrease the
rebound damping (speed the return stroke.) There are four full turns of adjustment available from full
clockwise.
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BUSHING REMOVAL
The high quality Garlock DU bushings are designed to outlast
many months of hard riding. The protective boots, a clean
fork and timely greasing are keys to long bushing life.
However, like all moving parts, bushings will eventually wear
and need replacement. Increased fore and aft movement of
upper tubes in lower tubes (similar to a loose headset) and
slow action, even after a fresh greasing, signals the need to
remove and replace bushings.
Figure 5A
Figure 5B
1.
2.
3.
4.
5.
6.
First, remove lower tube/brace assembly as detailed in
previous section, REMOVING LOWER TUBES.
Remove brakes as per manufacturer’s instructions.
Figure 5C
Next, remove fork brace by unscrewing 6mm fork brace bolts with an
appropriate hex wrench and unscrew 8mm brake boss bolts with an open
end wrench. Remove the dust seal with a small, flat-blade screwdriver.
Slide Judy bushing puller adapter tool over aluminum end of a Mag seal puller
tool. Insert bushing puller tool inside lower tube and engage lower edge of
upper bushing with lever of tool. See figure 5A.
Slide seal puller tool over handle of the bushing puller until it sits on lower
tube. See figure 5b.
Invert the entire assembly with tool engaged with bushing and clamp puller
tool handle in vise. Now, unscrew seal puller tool by hand or by using 32 and 36mm headset
wrenches until the upper bushing has pulled free. See figure 5C.
7. Repeat this procedure for lower bushing.
8. Repeat this entire procedure for other lower tube. Clean the inside of each lower tube to remove dirt
and old grease.
1.
2.
3.
Figure 5D
4.
BUSHING REPLACEMENT
Looking at your replacement bushings, determine which
bushings have the large outer diameter. These are upper
bushings, set them aside.
Take one smaller outer diameter (lower) bushing and
lube interior and exterior surfaces with Judy Butter or
other non-lithium high quality bearing grease. Place
bushing over end of bushing installer post with sleeve
and spacer in place. See figure 5D and illustration 5E.
Place lower tube without dust wiper over this assembly
and insert mallet drift into counter-bore of lower tube.
Using a soft mallet, gently tap drift until lower tube
bottoms on bushing installer tool base. See figure 6A.
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Lower
Bushing
Spacer
Installer
post
Sleeve
Base
Figure 5E

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BUSHING REPLACEMENT (Cont.)
5.
6.
7.
8.
Figure 6A
9.
Remove lower tube and slide sleeve and spacer off of
the end of the installer tool. Slide a new, greased
upper bushing (with the larger O.D.) onto the installer
tool. (See figure 6B.)
Use a soft mallet to gently tap upper bushing into lower
tube until lower tube bottoms on bushing installer tool base.
Repeat this entire procedure for other lower tube.
See the previous section REINSTALLING THE LOWER
TUBES for details on reinstalling the lower tubes.
After installing lower tubes, reassemble fork brace being
Figure 6B
sure to use medium strength threadlock (blue 242 Loc-tite) on fork brace bolt and brake post threads.
CAUTION: USE ANTI-SEIZE ON ALL TITANIUM FASTENERS!
10. Torque all bolts to 60 in/lbs. Remember to check torque every month or every 40 hours of riding.
Reinstall brakes per manufacturer’s instructions.
Figure 6C
Figure 6D
CHANGING TRAVEL
Judy XC, SL and FSX models are capable of having any of three travels that are
available: 2″ (50mm), 2.5″ (60mm), or 3″ (75mm). The list below gives part
numbers for different cartridge kits available: (cartridge kit=cartridge and
neutral shaft)
2.0″ (50mm) adj. cartridge kit 59053
2.5″ (60mm) adj. cartridge kit 59054
3.0″ (75mm) adj. cartridge kit 59055
The standard MCU spring stack may need to be adjusted when travel is changed.
MCU spring kit part number 59043 includes 2 solid, 4 blue, 4 red springs. See
previous REMOVING MCU STACKS section for details on changing MCIJ spring stack.
1. To change damper cartridge and neutral shaft, start by removing lower tube/
brace assembly (see previous section, REMOVING LOWER TUBES for details).
With lower tubes removed, use internal snap ring pliers to remove snap ring on
end of each upper tube. See figure 6C.
CAUTION: MAKE SURE THE FORK HAS BEEN AT REST FOR A MINIMUM OF
15 MINUTES BEFORE REMOVING SNAP RING.
2. Next, grab end of each shaft and gently pull cartridge and neutral shaft
assembly free of each upper tube, one at a time.
3. Prior to installing new damping cartridge into left upper tube, make certain that
cone-shaped shaft end plate is installed on shaft end that is NOT threaded to accept a 6mm bolt.
4. Install a plastic cartridge washer onto other end.
CAUTION: BE SURE TO PROPERLY INSTALL CARTRIDGE WASHER BETWEEN THE CARTRIDGE AND
RETAINING CLIP.
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Figure 7A
CHANGING TRAVEL (Cont.)
5. Slide cartridge into upper tube with end plate side first.
NOTE: On ’96 SL forks, make sure the cartridge stop clip is properly seated in
its groove within the upper tube.
6. Reinstall snap ring, sharp outside edge facing out. Make certain cartridge
washer is in place, snap ring is oriented correctly and fully engaged in groove
of upper tube.
CAUTION: IT IS VERY IMPORTANT THAT THE SNAP RING IS CORRECTLY
INSTALLED AND FULLY ENGAGED IN THE UPPER TUBE. IF THE SNAP RING
WORKS ITSELF LOOSE, THERE WILL BE A SEAL FAILURE IN THE CARTRIDGE
AND THE HYDRAULIC FLUID WILL LEAK OUT.
7. Repeat this entire procedure to install neutral shaft assembly of matching travel length in right upper
tube. See figure 7A for the correct sequence of neutral shaft assembly parts.
8. After installing cartridge and matching neutral shaft assembly, reinstall lower tubes. See
REINSTALLING LOWER TUBES.
CARTRIDGE SERVICE
INTRODUCTION
SECTION
ROCK SHOX JUDY CARTRIDGE— The Judy damper cartridge is designed to be fully servicable
and tuneable. Use the proper tools and procedures to keep Judy cartridges operating properly. The best
performing cartridges have the least amount of air inside. Keep this in mind when servicing your cartridge.
CARTRIDGE DISASSEMBLY AND OIL CHANGE
Figure 7B
1.
2.
3.
4.
Remove the cartridge from the fork. See previous section, Changing Travel,
for details on removal.
Slide off the plastic cartridge washer. Hold the cartridge over an oil recepticle
with the exposed seal end down and tap the damper shaft with a mallet, firmly
holding the cartridge body, to press the seal out of the cartridge body. (fig. 7B)
Once the seal is exposed, drain the oil from the cartridge into the oil container.
Pull the damper shaft free of the cartridge body. Inspect the damper shaft for
nicks or scratches that may cause oil leakage. Replace assembly as needed.
Inspect the inside bore of the cartridge body for scoring or scratches that may
cause oil leakage. Replace cartridge body as needed.
Continued on next page
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CARTRIDGE DISASSEMBLY (CONT.)
5. For adjustable compression cartridges unscrew the adjuster rod completely
with a 2mm hex and remove from the damper shaft. (fig. 8A)
CAUTION: REMOVE THE ADJUSTER ROD GENTLY TO AVOID DAMAGING THE
ADJUSTER ROD O-RING ON THE THREADS OF THE SHAFT WHEN REMOVING.
Note: The adjuster rod in the DH rebound cartridge is not removable.
6.
7.
Figure 8A
Clean the following parts with a clean, lint-free rag: damper shaft, seal,
cartridge body.
Press upper seal out of cartridge body by using a 2mm hex key, alternating
through the four access holes in cartridge body. finish seal removal using a
flat-blade screwdriver through the shaft hole.
WARNING: USE EXTREME CARE NOT TO DAMAGE THE CARTRIDGE BORE.
8. For DH cartridges, remove top retaining clip and plastic shaft guide washer to allow seal to be
pressed out through top of cartridge using upper seal installation tool.
Note: Some 50mm and 60mm cartridges use a plastic spacer located inside or outside upper seal.
9. Identify whether piston has an O-ring or a piston glide ring (pistons with three ports have an O-ring,
pistons with four ports have a glide ring). For pistons with an O-ring, remove and replace the O-ring
and inspect rebound plate (white plastic washer) for freedom of movement. If plate is not free,
replace assembly. For pistons with a glide ring, inspect ring for nicks and scratches and that it
shuttles freely on the piston. Replace as needed.
Note: The piston shaft is available in assembly form only. Do not disassemble.
10.Remove and replace adjuster rod O-ring. Grease liberally prior to installation onto adjuster rod
II-For 50 and 60mm cartridge assemblies, determine which cartridge body you have.
50mm 4.59″ body (PN43101) and 1″ spacer (PN42265) or 3.59″ body (PN43105)
60mm 4.59″ body (PN43101) and 1/2″ spacer (PN42266) or 4.09″ body (PN43104)
This will help you determine which cartridge body you may need to order.
1.
2.
Figure 8B
CARTRIDGE ASSEMBLY
Lightly coat inside of cartridge body with RockShox oil. If a spacer was used,
reinstall it into the cartridge. Apply grease to a new upper cartridge seal inside
and out. Slide seal, pocket-side down, onto upper seal installation tool. Press
the seal into seal bore of cartridge until fully seated (Fig. 8B). Remove upper
seal installation tool.
For DH cartridges, reinstall retaining ring, sharp side out, and make sure it is
fully seated into its groove. Next, reinstall plastic shaft guide and then press
upper seal into cartridge bore, as previously described. Make sure seal is fully
seated, as plastic shaft guide should not be loose in the cartridge.
Continued on next page
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Figure 9A
Figure 9C
Figure 9E
Figure 9G
CARTRIDGE REASSEMBLY (CONT.)
3.
Insert shaft guide tool into cartridge body and seal.
(fig. 9A) Place assembly into cartridge body fixture.
(fig. 9B) Fill cartridge 1/2 full with RockShox oil.
Apply oil to piston O-ring or glide ring and insert piston
shaft assembly into cartridge, mating shaft with shaft
guide tool. Then push piston/shaft assembly through
the upper seal forcing shaft guide tool out. (Fig 9C)
4.
Lift entire cartridge body fixture and remove shaft guide
tool from bottom side, taking care not to lose any oil from
the cartridge. (fig. 9D)
5.
Push piston/shaft assembly into cartridge body until it
stops. Add more oil until it’s about 2/3 full, using care
not to pull shaft back through the seal and the piston
out of the oil. Cycle piston/shaft assembly several
times until no air bubbles are seen in the oil. (Fig. 9D)
6.
Push piston/shaft assembly fully into cartridge body
until it stops.
7.
Install top-out O-ring and seal washer onto shaft.
8.
fill cartridge body fully with RockShox oil.
9.
Apply grease to new seal, inside and out, fully filling
pocket of seal with grease.
10. Using your fishing line or cut main seal O-ring
(PN 51104), place in I.D. of seal. (Fig. 9E)
11. Carefully install this seal assembly, pocket-side down,
over shaft, being careful not to damage sealing lips on
the flats of shaft and maintaining orientation of fishing
line between seal and shaft. (Fig. 9F)
Note: Make sure fishing line does not get caught between
cartridge body and seal O.D.
Figure 9B
Figure 9D
Figure 9F
12. Place seal installation tool over exposed shaft and press seal into cartridge
body, leaving Imm of seal exposed above cartridge body lip. (Fig. 9G)
CAUTION: HOLD A RAG AROUND LOWER SEAL INSTALLATION TOOL AS OIL
WILL BE FORCED OUT THROUGH THE VENT HOLES OF THE TOOL.
Note: The lower seal can be pressed in too far. Leave Imm
exposed.
13. Remove fishing line from seal.
Continued on next page
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