Harken MKIV Unit 3 User manual

WARNING! Strictly follow all instructions
to avoid an accident, damage to your vessel,
personal injury or death. See www.harken.com
for additional safety information.
Please read these instructions carefully before installing, servicing, or operating the equipment.
This manual may be modified without notice. See: www.harken.com/manuals for updated versions.
PLEASE SAVE THESE INSTRUCTIONS
MKIV HYDRAULIC JIB REEFING & FURLING
Unit 3
Installation Manual – Intended for specialized personnel or expert users
4379 v1 08/21
Preassembly
Introduction and safety precautions 2
Part descriptions 2 - 3
Sizing check 3
Parts 4 - 5
Rigging parts check/tools 6
Hydraulic system 7 - 8
Toggle deductions/stay into foil options 9
Top foil lengths 10 - 11
Short top foil 11
Confirm foil length 12
Assembly
Foils/connectors 13 - 18
Bottom foil/connectors/halyard swivel 19
Lower unit to foil 20
Rod rigging: rod adapter stud 21
Attach turnbuckle/toggle 22 - 23
Attach hydraulic cylinder 23 - 24
Feeder/final 25
Commissioning
Turnbuckle on boat 26
Halyard swivel height/lead angle 27
Halyard restrainer/tension 28
Operation
Halyard: headstay tension 29
Reefing/secure sail 30
Manual operation 31
Race conversion 32
Maintenance/Inspection/Decommissioning 33
Troubleshoot/Warranty 34
Appendix
Component part number list 35 - 37
Toggle dimensions 38
Dimensions/sailmaker's instructions 39

MKIV hydraulic unit 32
Part Descriptions
1) Jaw/jaw toggle
2) Toggle housing
3) Toggle housing insulator
4) Hydraulic cylinder
5) Lower unit
6) Calibrated guide
7) Shackles
8) Foil clamp
9) 610 mm (2') bottom foil
10) Feeder
11) Connector bushing
12) Bottom connector
13) 2.13 m (7') foil
14) Connector screws
15) Connector wedge
16) Connector
17) Halyard swivel
18) Trim cap
19) Trim cap screws
1
2
34
5
8
7
6
10
9
11
1
3
WARNING! Strictly follow all instructions to avoid potential hazards that may kill or
hurt you and others. See www.harken.com/manuals for general warnings
and instructions.
WARNING! This symbol alerts you to potential hazards that may kill or hurt you and others
if you don't follow instructions. The message will tell you how to reduce the
chance of injury.
Introduction
This manual gives technical information on installation and service. The information is destined exclusively for
specialized personnel or expert users. Installation, disassembling, and reassembling by personnel who are not
experts may cause serious damage to property, or injury to users and those in the vicinity of the product. If you
do not understand an instruction, contact Harken.
The user must have appropriate training in order to use this product.
Harken accepts no responsibility for damage or harm caused by not observing the safety requirements and
instructions in this manual. See limited warranty, general warnings and instructions in www.harken.com/manuals.
Purpose
Harken®jib reefing and furling is designed for rolling sails on sailboats to reduce sail size or to completely roll the
sail so wind has little effect. Use of this product for other than normal sailboat applications is not covered
by the limited warranty.
Safety precautions
CAUTION! This symbol alerts you to potential hazards that may hurt you and others if
you do not follow instructions. The message will tell you how to reduce the
chance of injury.
Introduction Safety Precautions

MKIV hydraulic unit 3 3
Preassembly Sizing Check
11
12
13
14
15 16
17
3. Will lower unit fit on bow? See page 9. If necessary, use an additional toggle to slightly raise unit.
Sizing check
1. Check headstay and clevis pin dimensions in chart below.
2. Harken does not recommend drilling boat’s chainplate or toggle. Bushings may be required to fit boats with
smaller clevis pin sizes.
UNIT 3
Unit part no. Description Wire Ø
7413.15 MKIV hydraulic unit 3 (aluminum foils)
Note: Black foils standard. Silver foils available.
7
/ 16 ",
1
/ 2 "11 mm, 12 mm
Rod Ø
7413.16 MKIV hydraulic unit 3 (carbon foils) -22, -30 9.53 mm, 11.10 mm
Toggle part no. Description Toggle clevis Ø
7413.25 3/4 Toggle assembly
3
/ 4 "19.1 mm
7413.25 7/8 Toggle assembly
7
/ 8 "22.2 mm
7413.26 3/4 Hydraulic cylinder/toggle
3
/ 4 "19.1 mm
7413.26 7/8 Hydraulic cylinder/toggle
7
/ 8 "22.2 mm
18
19
D
GE
F
B
A
C
H
See page 39 for all
toggle dimensions
WARNING! Do not drill boat's chainplate or toggle. This may result in rig failure.
Use the correct size toggle and clevis pin.
This manual shows both black and clear foils.
In April 2021 MKIV furlers began shipping with
black foils. Clear anodized foils also available.

MKIV hydraulic unit 34
Preassembly Parts
Main components
Description Part no. Qty
Lower unit See parts list 1
7'(2.13 m) foil, black anodized, standard 7413.30.BLACK 10
2'(610 mm) bottom foil, black ano, standard 7413.33.BLACK 1
7'(2.13 m) foil, clear anodized, special order 7413.30.CLEAR 10
2'(610 mm) bottom foil, clear, special order 7413.33.CLEAR 1
Halyard swivel H-39392 1
Emergency crank handle 7430 1
Drill adapter for manual drive 7431 1
Halyard swivel
unit 3H
Emergency
crank handle
Drill adapter for
manual drive
Lower unit
unit 3H
2.13 m (10 - 7') foils
Unit 3, 4
2' (610 mm)
Bottom Foil
Silver foils available

MKIV hydraulic unit 3 5
Preassembly Parts
Bow shackles
Trim cap
Plastic
connector
wedges
Foil screws
Feeder
5200
adhesive
Injector
3, 4, 6, 10 mm
Connectors
Bottom
connector
Connector bushings
Trim cap screws
Description Unit Qty
3, 4, 6, 10 mm hex wrenches 3 1 each
Tools
Description Unit Part no. Qty Size
Connectors
3
7413.31F 9 9.75" (248 mm)
Bottom connector 7413.32F 1 14" (356 mm)
Connector bushing set HFG297
(20 EA H-42073/H-42074) 1 —
Plastic connector wedge set HFG324
(22 EA H-39487) 1—
Foil screw set HFG349
( 46 EA HFS1106) 1—
Trim cap set HFG682
(H-39751 / H-39752) 1 —
Trim cap screw set HFG672
( 3 EA HFS1127) 1—
Prefeeder 947 1 —
Feeder with screw and tab H-39756 1 —
10 mm bow shackle 2124 3 10 mm
Red Loctite HFG739 2 .017 oz.
Blue Loctite 833 1.017 oz.
Injector, 1 oz. 5200 adhesive HFG725 11 oz.
Other components
Prefeeder
Blue Loctite
adhesive
Red Loctite®
adhesive
Loctite is a registered trademark of Henkel AG & Company KGaA.

MKIV hydraulic unit 36
Preassembly Rigging Parts Check/Tools/Adhesive
MKIV furlers are shipped with 3M 5200
adhesive. Use adhesives on dry connectors
and foils using the special injection system
described in the assembly section. Parts
may immediately be exposed to rain. Cure
is best at 70° F (22° C) with 50% humidity.
Do not apply at temperatures below 40° F
(5° C) and above 100° F (38° C).
Although adhesive has not cured, it will
remain in place on foil joints whether
they are left on the ground or raised up
on boat. Foils can be raised immediately
after assembly and sails fitted.
Note: A small amount of adhesive may
bulge out of injection ports. If possible, let
system sit for several days before sailing.
If adhesive gets on sails, remove using
acetone. For faster-curing adhesive, pur-
chase 4200 Fast Cure adhesive sealant.
Note: Damaged foils can be repaired.
Use a hand-held propane torch to heat
joints until foils can be pulled apart.
Adhesive alert
1. Long tape measure 6. Side cutters 11. Center punch
2. Short tape measure 7. Rat-tail file 12. Rigging or black tape
3. Power drill 8. Hex wrenches (provided) 13. Scissors
4. Drill bit – 5/32" (4 mm) 9. Slotted/Phillips screwdrivers 14. Metal straight edge
5. Hacksaw 10. Needle-nose pliers 15. Hammer
16. Metric ball-end hex wrenches (recommended but not required)
10
13
12
11
8
7
6
5
3
2
1
15
4
14
9
Toggle assembly
1. Harken toggle assembly or hydraulic cylinder required. Sold separately.
2. Mating turnbuckle components with eye at lower end must be purchased
separately. See page 10.
3. Headstay may require cutting and shortening to fit Harken toggle. Some
headstays may remain uncut by replacing lower stud of turnbuckle with
stud/eye, eliminating extra toggle.
4. Rod rigging requires Harken rod adapter stud.
Harken toggle
assembly housing
(sold separately)
Unit Part no.
3H 7413.25 3/4
7413.25 7/8
16
Rod rigging
Harken rod adapter
stud required
(sold separately)
Unit Part no.
3H 7426 -22
7427 -30
Hydraulic length-
adjusting cylinder
(sold separately)
Unit Part no.
3H 7413.26 3/4
7413.26 7/8
WARNING! A stay that is old or damaged may break
suddenly, causing an accident. Headstay condition
should be checked by a professional rigger before reusing.
Hydraulic hoses and adapters
Hoses and adapters are not supplied with furler. See next page for
specifications.
Tools required

MKIV hydraulic unit 3 7
1 2 3 4 5 6 7 8
10
20
30
40
50
60
70
Flow GPM (l/min)
Furling speed RPM
Furling torque in - lb (n - m)
500
57
1000
113
1500
170
2000
226
3000
339
2500
282
500 1000 1500 2000
Pressure PSI (bar)
Furler power requirements
The furling unit and hydraulic tensioning
cylinder will work with all current Harken
hydraulic power plants.
Unit
Recommended
flow rate
34 g/m 15 l/m
3.8 7.6 11.4 15.1 18.9 22.7 26.5 30.3 35 70 105 140
Maximum operating pressure
Set relief valve on power plant at 140 bar or 2000 PSI. Harken powerpacks ship with valves set at 140 bar.
Valves on power unit
Furler can be used with open or closed center, 4-way, 3-position control valves.
Gear oil specifications
Unit is sealed with a light bath of ISO 68 gear oil.
IMPORTANT! The only parts of furler to be disassembled by installer are the torque tube clamp and toggle hous-
ing. All other work should be performed by factory-authorized personnel. Work performed by unauthorized per-
sonnel may void the Harken limited warranty.
Hose and fitting selection recommendation
Hose type - SAE 100 R8 hose. Alternatively SAE 100 R2 may be used.
Hose size - Use -6 hose (3/8" ID). Long runs may require larger hoses.
Hose end fitting, furler end - Female swivel hose end to mate with adapter.
Note: See hydraulic connection to furling unit, next page.
Measure hydraulic hose runs
Remember these important points when measuring runs.
1) Short straight runs between HPU and function are best.
2) Avoid sharp edges which may chafe the hose.
3) Minimize fittings/connections throughout the run to avoid possible leak points.
4) Minimize 90° bends. They increase system losses and decrease performance.
If unavoidable, use a 90° swept fitting. Do not use a 90° elbow fitting.
CAUTION! Do not exceed the manufacturer specified minimum bend radius.
When ordering, specify that all hoses are flushed, filled with clean oil, and capped at point of purchase.
HARKEN recommends ISO 46 grade oil. If hoses are shipped, they may not contain oil.
CAUTION! Always ensure pressure rating for selected hose is equal to or greater than 2000 psi/140 bar.
Note: Hose shortening - Hydraulic hoses typically shorten 2% to 4% of total length when pressurized. When routing
and measuring hose lines, ensure extra hose length is added to compensate.
Preassembly Hydraulic System

MKIV hydraulic unit 38
Hydraulic length adjusting cylinder (optional)
Pressure requirements
The hydraulic length adjusting cylinder requires a pressure of max 5000 lb (350 bar) to develop rated pull force
on the headstay. The hydraulic pressure for the cylinder can be provided by a high pressure manual system or the
boats power unit. If the cylinder is used with a power unit that provides less than 5000 psi (350 bar), a hydraulic
intensifier is required to step up the pressure. Either power source requires the use of a zero-leak control valve so
the pressure to the cylinder doesn’t bleed down over time.
Hydraulic cylinder hose connection
The cylinder has a -4 JIC fitting. Choose appropriate hose and end fitting.
Cylinder gas
Cylinder is shipped without gas. Fill fitting is a Schroeder type. For best clean performance use nitrogen or argon
gas pressurized to 50 - 60 psi (3.45 - 4.48 bar).
Specifications:
Stroke: Unit 3: 100 mm (4")
Performance:
Cylinder pull force lb
12000
10000
8000
6000
4000
2000
0
600040002000
Hydraulic pressure in LB
Cylinder pull in LBS
0
Cylinder pull force kg
6000
5000
4000
3000
2000
1000
0
400
200
100
Hydraulic pressure in BAR
Cylinder pull in KG
300
0
WARNING! Relieve all pressure prior to disconnecting. Only work on cylinder and connections
if you are a hydraulic technician.
Leak check
To perform leak check, run furler in a single direction for 5 – 10 seconds. If installation was completed with empty
hoses, increase the run time to 10 – 30 seconds. Perform the following:
1) Confirm hose run is correct by verifying operation of intended function.
2) Inspect each fitting for leakage.
3) Tighten fitting as necessary.
4) Repeat procedure for all functions.
IMPORTANT! If installation was completed with empty hoses, check the oil level indicator, and add oil as necessary.
One-way function flush
Flush the pump motor through the power unit system filter by running furler in a single direction. Run in same
direction as previous step. This process helps ensure system cleanliness by depositing contaminates into
the power unit system filter.
Hydraulic connection to furling unit
Furling unit has SAE female straight thread ports to accept -6 ORB fittings. Use male to male adapters in the furler
so you can use female swivel hose ends. Use -6 JIC X -6 ORB adapters - Stainless steel
IMPORTANT! Do not use PTFE tape or sealant on threaded connections to Harken ports. Using PTFE tape can damage threads.
Hydraulic oil
Use only hydraulic oil ISO 46 grade or equivalent.
IMPORTANT! Hydraulic oil may damage paint and some surfaces.
Preassembly Hydraulic System
CAUTION! Hydraulic oil may cause skin irritation.

MKIV hydraulic unit 3 9
Preassembly Toggle Deductions/Stay into Foil Options
Use dimensions of Harken toggles or cylinders shown below to build stay to correct length.
Toggle assembly
Turnbuckles should be one-half (1/2) to two-thirds (2/3) open to allow shortening for new wire stretch, for fine-tuning
mast rake,
and to help connect the stay.
Hydraulic cylinder
Length for hydraulic cylinder can be determined at one-half (1/2) to two-thirds (2/3) open to allow shortening for new
wire stretch for fine-tuning mast rake, and to help connect the stay. Stroke length for unit 3 cylinder is 100 mm (4").
Options for snaking stay into foils
Toggle
part no.
Clevis pin
Ø
Pin-to-pin
length
7413.25 3/4 3/4" (19.1 mm) 3
1
/ 4 " (83 mm)
7413.25 7/8 7/8" (22.2 mm) 3
7
/8" (98 mm)
Hydraulic cylinder
part no.
Clevis pin
Ø
Max pin-to-pin
length
Min pin-to-pin
length
7413.26 3/4 3/4" (19.1 mm) 20" (50 mm) 16" (400 mm)
7413.26 7/8 7/8" (22.2 mm) 20
1
/2" (525 mm) 16
1
/2" (420 mm)
WARNING! Using a threaded nosepiece with only adhesive
at the upper rod eye terminal may result in headstay failure.
Make sure there is a mechanical lock.
STA-LOK is a registered trademark of STA-LOK terminals.
1. Swage stud at end of wire.
2. Open end of wire and install Norseman or Sta-Lok®stud after foil is assembled.
3. Rod adapter fitting (not supplied by Harken).

MKIV hydraulic unit 310
Preassembly Top Foil Length
Length chart
Dimensions Inches mm
ACenter of pin to bottom of terminal
BBottom of terminal to top of foil
1.00 25
CTop foil length
DNumber of foils ________ x 84" (2133.6 mm)
EBottom foil 24.00 610
FBottom of foil to top of toggle housing insulator 23.18 589
GTop of toggle housing insulator to clevis pin
Pin-to-pin length
Measure A and add to this chart
and length chart below
Inches mm
A
B 1 25
E24 610
F23.18 589
G
Total A+B+E+F+G
Make sure upper
measurement points
of A and pin-to-pin
are the same.
1Pin-to-pin length
2Subtract ABEFG –
3Result (pin-to-pin – ABEFG)
4Subtract D –
To find D pick number from chart below that is closest to,
but not greater than total from step 3.
Inches mm
7 x 84 = 588
8 x 84 = 672
9 x 84 = 756
10 x 84 = 840
11 x 84 = 924
7 x 2133.6 = 14935.2
8 x 2133.6 = 17068.8
9 x 2133.6 = 19202.4
10 x 2133.6 = 21336
11 x 2133.6 = 23470
Example–if result from Step 3 is:
800 inches D = 756 inches 20000 mm D = 19202 mm
5Result (C) top foil length
After completing worksheet above, fill in A, C, D and G below. Add
A through G to confirm total equals your pin-to-pin measurement.
Length check
Alternate
measurement
point A
Pin
to
pin
Top Foil Length Worksheet
G toggle distance from lower clevis pin to top of toggle housing insulator
Toggle
part no. Type Clevis pin G distance
in mm in mm
7413.25 3/4 Toggle assembly 3/419.1 4.39 112
7313.25 7/8 Toggle assembly 7/822.2 4.98 126
7413.26 3/4 Hydraulic cylinder/toggle 3/419.1 19.32* 491*
7313.26 7/8 Hydraulic cylinder/toggle 7/822.2 19.99* 508*
*Dimensions with cylinder 58% open
UNIT 3H
Cylinder pin
Ø
G distance (closed) G distance (open)
in mm in mm
3/4 17.00 432 21.00 533
7/8 17.67 449 21.67 550
A
C
D
E
F
Pin
to
pin
B
G
G

MKIV hydraulic unit 3 11
Preassembly Short Top Foil
If top foil is shorter than 248 mm (93/4") , use one of the following techniques to ensure sufficient bearing
surface for the foil in the area of the halyard swivel.
89 mm (31/2")
76 mm (3")
64 mm (21/2")
51 mm (2")
38 mm (11/2" )
248 mm (93/4") No special treatment required.
248 mm (93/4")
244 – 181 mm (95/8" – 71/8") Do not use plastic
bushing above top connector.
244 – 181 mm (95/8" – 71/8")
178 – 140 mm (7" – 51/2") Do not use plastic bushing
above top connector. Shorten top of connector and if
necessary shorten trim cap.
(178 – 140 mm (7" – 51/2")
137 – 102 mm (53/8" – 4") Do not use plastic bushing
above top connector. Cut connector right at cross formed
by glue dispersion channels. Use single (1) foil screw in
top foil only.
137 – 102 mm (53/8" – 4")
Under 38 mm (11/2") eliminate top foil and run foil
higher in foil clamp.
Under 38 mm (11/2")
Top foil
length from
worksheet
1. Initial
top foil
cut length
2. Cut through
middle hole in
top foil*
3. Shorten
full length
adjoining
foil by
cutting
through
middle
hole*
4. Shorten
connector
5. Shorten
trim cap
Resulting top
foil length Length
31/2"
(89 mm)
69/16"
(167 mm)
5"
(127 mm)
47/8"
(124 mm) No
3"
(76 mm)
61/16"
(154 mm)
41/2"
(114 mm)
47/8"
(124 mm) No
21/2"
(64 mm)
69/16"
(167 mm)
4"
(102 mm)
47/8"
(124 mm) No
2"
(51 mm)
51/16"
(129 mm)
31/2"
(89 mm)
43/8"
(111 mm) Yes
11/2"
(38 mm)
49/16"
(116 mm)
3"
(76 mm)
33/4"
(95 mm) Yes
89 – 38 mm (31/2" – 11/2") Shorten top foil and adjoining
full length foil so two (2) screws are used to assemble
joint instead of four (4). Do not use plastic bushings
above top connector.
*To allow for saw cut, position blade so upper half of
middle hole is preserved.
Cut-offs
Do not use
Cut-offs
Do not use
Cut-offs
Do not use
Cut-offs
Do not use
Cut-off
Do not use

MKIV hydraulic unit 312
Preassembly Check Foil Length
Line up bottom foil so foil clamp
is centered or just below center
of notches in bottom foil.
Confirm foil length by laying foils alongside stay with turnbuckle components. Pull stay out so it is straight. Attach
Harken toggle to bottom of stay using cross pin. Adjust turnbuckle so that length of stay with Harken toggle will fit
boat. Ideally, turnbuckle will be one-half (1/2) to two-thirds (2/3) open to allow for rig adjustment.
Line up lower unit so base of unit lines up with toggle housing.
Attach one (1) link plate to lower unit. Line up lower unit so link plate hole lines up with cross pin in Harken toggle.
Make sure toggle is tensioned when measuring.
Note: Position top foil so that with top
cap the foil will ride 25 mm (1") below
terminal. If wire fitting at top of stay is
swage, foil must ride just below shoulder
of swage. Mark cut line on foil. Wrap tape
around foil as a guide so cut is straight.
If 7304 halyard deflector is
used, add 25 mm (1")

MKIV hydraulic unit 3 13
Assembly Top Foil
Deburr inside edge using rat-tail file.
Cut foil to length using hacksaw.
Prepare top foil for drilling.
Tip: Mark top foil to distinguish
from cutoff piece.
Scribe line on top of foil to mark drill
holes. Lay top foil alongside cut off
piece and use a flat metal object
(i.e. metal ruler) to scribe top
line of foil.

MKIV hydraulic unit 314
Assembly Top Foil
Cut out template at right. Line up template
with top of foil and scribed line. Tape in
place. Use center punch to mark holes.
Check center punch marks to confirm
they are 10 mm (3/8") and 35 mm (13/8")
from top of foil.
Drill two (2) 4 mm (5/32") holes
for trim cap.
Lay top foil in line with others. Slide stay
into top foil and down line of foils or slide
each foil up stay.
!
Foil
Top
35 mm (13/8")
10 mm (3/8" )

MKIV hydraulic unit 3 15
Assembly Top Foil
Place halves of plastic bushings on stay
so hooked part of longer section faces out.
Tip: With foil screw holes up (shown
below), place longer half of bushing
with hook on upper half.
Install trim cap. Place each side over wire.
Push trim cap into foil to start, then tap
in using hammer.
Install trim cap screws.
Hook on upper half

MKIV hydraulic unit 316
Assembly Top Foil/Connectors
Slip connector on wire, mating hook
of plastic bushing with connector.
Put a drop of red Loctite®adhesive into
screw holes.
Loctite is a registered trademark of Henkel AG & Company KGaA.

MKIV hydraulic unit 3 17
Assembly Foils/Connectors
Start plunger into injector and immediately
hold upright so plunger is down and
applicator tip is up.
As sealant runs down toward plunger an air
pocket will form near tip. Push plunger to
evacuate air. Begin injecting adhesive.
Hold plastic wedge in place with thumb
as you insert into foil. Line foil holes
with connector screw holes.
Tip: In cooler weather, keep sealed
adhesive in pocket to keep warm. Use
instructions below to fill injector less
than half way; you will only use a small
amount of adhesive. Refill if needed
but do not keep open sealant for long
periods. Use adhesive within three
(3) hours.
Use cap of adhesive to break seal. Remove
injector tip cap and plunger. Hold injector
at an angle with applicator tip facing down.
Squeeze adhesive into tube so lower half
of injector is full. Keep tip free
of sealant to let air inside.
Loading injector with adhesive
Adhesive in
lower half

MKIV hydraulic unit 318
Assembly Foils/Connectors
Tighten screws into connector holes.
Make sure a drop of red Loctite® adhesive
entered each screw hole. If not, apply to
screw.
Use bushings, connector, wedge, and
adhesive in other screw hole and insert
into other foil. Use 1 to 11/4 ml of adhesive.
Use “ml”
marks to
estimate 1
to 11/4 ml of
adhesive
Stop when you see a small
amount of adhesive enter
one screw hole
Unit Adhesive
31to 11/4ml
Inject a small amount of adhesive
into middle hole.
Tip: When you see a small amount
of adhesive enter one screw
hole, stop. You have applied
enough adhesive.
Red Loctite
Loctite is a registered trademark of Henkel AG & Company KGaA.

MKIV hydraulic unit 3 19
Slide halyard swivel onto foil above
feeder window. Make sure taller “half”
is up as shown.
Assembly Bottom Foil/Connectors/Halyard Swivel
Continue installing connectors and wedges.
Make sure to use red Loctite®adhesive in
screw holes.
Continue assembly. Use 356 mm (14")
bottom connector to assemble bottom foil.
Red Loctite
Red Loctite
Loctite is a registered trademark of Henkel AG & Company KGaA.

MKIV hydraulic unit 320
Loosen foil clamp screws at top
of lower unit assembly.
Slide assembly onto foils.
Tip: Face clamp downward so it
clears foil notches during installation.
Assembly Lower Unit to Foil