Hitachi ZX70-3 Instruction manual

SAFETY
SA-1
RECOGNIZE SAFETY INFORMATION
These are the SAFETY ALERT SYMBOLS.
 When you see these symbols on your machine or
in this manual, be alert to the potential for per-
sonal injury.
 Follow recommended precautions and safe oper-
ating practices.
001-E01A-0001
SA-688
UNDERSTAND SIGNAL WORDS
On machine safety signs, signal words designating
the degree or level of hazard - DANGER, WARNING,
or CAUTION - are used with the safety alert symbol.
 DANGER indicates an imminently hazardous
situation which, if not avoided, will result in death
or serious injury.
 WARNING indicates a potentially hazardous
situation which, if not avoided, could result in
death or serious injury.
 CAUTION indicates a potentially hazardous
situation which, if not avoided, may result in minor
or moderate injury.
 DANGER or WARNING safety signs are located
near specific hazards. General precautions are
listed on CAUTION safety signs.
 Some safety signs don't use any of the desig-
nated signal words above after the safety alert
symbol are occasionally used on this machine.
To avoid confusing machine protection with personal
safety messages, a signal word IMPORTANT indi-
cates a situation which, if not avoided, could result in
damage to the machine.
NOTE indicates an additional explanation for an
element of information.
002-E01A-1223
SA-1223

SAFETY
SA-2
FOLLOW SAFETY INSTRUCTIONS
Carefully read and follow all safety signs on the
machine and all safety messages in this manual.
Safety signs should be installed, maintained and
replaced when necessary.
 If a safety sign or this manual is damaged or
missing, order a replacement from your author-
ized dealer in the same way you order other re-
placement parts (be sure to state machine model
and serial number when ordering).
Learn how to operate the machine and its controls
correctly and safely.
Allow only trained, qualified, authorized personnel to
operate the machine.
Keep your machine in proper working condition.
 Unauthorized modifications of the machine may
impair its function and/or safety and affect ma-
chine life.
 Do not modify any machine parts without au-
thorization. Failure to do so may deteriorate the
part safety, function, and/or service life. In addi-
tion, personal accident, machine trouble, and/or
damage to material caused by unauthorized
modifications will void Hitachi Warranty Policy.
 Do not use attachments and/or optional parts or
equipment not authorized by Hitachi. Failure to do
so may deteriorate the safety, function, and/or
service life of the machine. In addition, personal
accident, machine trouble, and/or damage to
material caused by using unauthorized attach-
ments and/or optional parts or equipment will void
Hitachi Warranty Policy.
The safety messages in this SAFETY chapter are
intended to illustrate basic safety procedures of
machines. However it is impossible for these safety
messages to cover every hazardous situation you
may encounter. If you have any questions, you
should first consult your supervisor and/or your au-
thorized dealer before operating or performing
maintenance work on the machine.
003-E01B-0003
SA-003

SAFETY
SA-3
PREPARE FOR EMERGENCIES
Be prepared if a fire starts or if an accident occurs.
 Keep a first aid kit and fire extinguisher on hand.
 Thoroughly read and understand the label at-
tached on the fire extinguisher to use it properly.
 To ensure that a fire-extinguisher can be always
used when necessary, check and service the
fire-extinguisher at the recommended intervals as
specified in the fire-extinguisher manual.
 Establish emergency procedure guidelines to
cope with fires and accidents.
 Keep emergency numbers for doctors, ambu-
lance service, hospital, and fire department
posted near your telephone.
004-E01A-0437
SA-437
WEAR PROTECTIVE CLOTHING
Wear close fitting clothing and safety equipment
appropriate to the job.
You may need:
A hard hat
Safety shoes
Safety glasses, goggles, or face shield
Heavy gloves
Hearing protection
Reflective clothing
Wet weather gear
Respirator or filter mask.
Be sure to wear the correct equipment and clothing
for the job. Do not take any chances.
 Avoid wearing loose clothing, jewelry, or other
items that can catch on control levers or other
parts of the machine.
Operating equipment safely requires the full atten-
tion of the operator. Do not wear radio or music
headphones while operating the machine.
005-E01A-0438
SA-428

SAFETY
SA-4
PROTECT AGAINST NOISE
Prolonged exposure to loud noise can cause im-
pairment or loss of hearing.
 Wear a suitable hearing protective device such as
earmuffs or earplugs to protect against objec-
tionable or uncomfortably loud noises.
006-E01A-0434
SA-434
INSPECT MACHINE
Inspect your machine carefully each day or shift by
walking around it before you start it to avoid per-
sonal injury.
 In the walk-around inspection be sure to cover all
points described in the "RE-START INSPEC-
TION" chapter in the operator's manual.
007-E01A-0435
SA-435

SAFETY
SA-5
GENERAL PRECAUTIONS FOR CAB
 Before entering the cab, thoroughly remove all dirt
and/or oil from the soles of your work boots. If any
controls such as a pedal is operated while with
dirt and/or oil on the soles of the operator's work
boots the operator's foot may slip off the pedal,
possibly resulting in a personal accident.
 Do not leave parts and/or tools lying around the
operator's seat. Store them in their specified loca-
tions.
 Avoid storing transparent bottles in the cab. Do
not attach any transparent type window decora-
tions on the windowpanes as they may focus
sunlight, possibly starting a fire.
 Refrain from listening to the radio, or using music
headphones or mobile telephones in the cab
while operating the machine.
 Keep all flammable objects and/or explosives
away from the machine.
 After using the ashtray, always cover it to extin-
guish the match and/or tobacco.
 Do not leave cigarette lighters in the cab. When
the temperature in the cab increases, the lighter
may explode.
524-E01A-0000

SECTION AND GROUP
CONTENTS
WORKSHOP MANUAL
SECTION 1 GENERAL
Group 1 Precautions for Disassembling
and Assembling
Group 2 Tightening
Group 3 Painting
Group 4 Bleeding Air from Hydraulic Oil
Tank
SECTION 2 UPPERSTRUCTURE
Group 1 Cab
Group 2 Counterweight
Group 3 Main Frame
Group 4 Pump Device
Group 5 Control Valve
Group 6 Swing Device
Group 7 Pilot Valve
Group 8 Pilot Shut-Off Solenoid Valve
Group 9 Shockless Valve
Group 10 Solenoid Valve Unit
Group 11 Engine
SECTION 3 UNDERCARRIAGE
Group 1 Swing Bearing
Group 2 Travel Device
Group 3 Center Joint
Group 4 Track Adjuster
Group 5 Front Idler
Group 6 Upper and Lower Roller
Group 7 Track
SECTION 4 FRONT ATTACHMENT
Group 1 Front Attachment
Group 2 Cylinder
SECTION 5 ENGINE
Group 1 General Information
Group 2 Engine

1P1W-1-1
SECTION 1
GENERAL
 CONTENTS 
Group 1 Precautions for Disassembling
and Assembling
Precautions for Disassembling and
Assembling ........................................... W1-1-1
Maintenance Standard Terminology ........ W1-1-7
Group 2 Tightening
Tightening Torque Specifications............. W1-2-1
Torque Chart ........................................... W1-2-2
Piping Joint ............................................. W1-2-5
Periodic Replacement of Parts................ W1-2-9
Group 3 Painting
Painting ................................................... W1-3-1
Group 4 Bleeding Air from Hydraulic Oil
Tank
Bleed Air from Hydraulic Oil Tank............ W1-4-1

GENERAL / Precautions for Disassembling and Assembling
W1-1-1
PRECAUTIONS FOR DISASSEMBLING
AND ASSEMBLING
Precautions for Disassembling and Assembling
Clean the Machine
Thoroughly wash the machine before bringing it into
the shop. Bringing a dirty machine into the shop
may cause machine components to be
contaminated during disassembling/assembling,
resulting in damage to machine components, as
well as decreased efficiency in service work.
Inspect the Machine
Be sure to thoroughly understand all
disassem-bling/assembling procedures beforehand,
to help avoid incorrect disassembling of
components as well as personal injury.
Check and record the items listed below to prevent
problems from occurring in the future.
 The machine model, machine serial number, and
hour meter reading.
 Reason for disassembly (symptoms, failed parts,
and causes).
 Clogging of filters and oil, water or air leaks, if
any.
 Capacities and condition of lubricants.
 Loose or damaged parts.
Prepare and Clean Tools and Disassembly Area
Prepare the necessary tools to be used and the
area for disassembling work.
Precautions for Disassembling
 To prevent dirt from entering, cap or plug the
removed pipes.
 Before disassembling, clean the exterior of the
components and place on a work bench.
 Before disassembling, drain gear oil from the
reduction gear.
 Be sure to provide appropriate containers for
draining fluids.
 Use matching marks for easier reassembling.
 Be sure to use the specified special tools, when
instructed.
 If a part or component cannot be removed after
removing its securing nuts and bolts, do not
attempt to remove it forcibly. Find the cause(s),
then take the appropriate measures to remove it.
 Orderly arrange disassembled parts. Mark and
tag them as necessary.
 Store common parts, such as bolts and nuts with
reference to where they are to be used and in a
manner that will prevent loss.
 Inspect the contact or sliding surfaces of
disassembled parts for abnormal wear, sticking,
or other damage.
 Measure and record the degree of wear and
clearances.

GENERAL / Precautions for Disassembling and Assembling
W1-1-2
Precautions for Assembling
 Be sure to clean all parts and inspect them for
any damage. If any damage is found, repair or
replace part.
 Dirt or debris on the contact or sliding surfaces
may shorten the service life of the machine. Take
care not to contaminate any contact or sliding
surfaces.
 Be sure to replace O-rings, backup rings, and oil
seals with new ones once they are disassembled.
Apply a film of grease before installing.
 Be sure that liquid-gasket-applied surfaces are
clean and dry.
 If an anti-corrosive agent has been used on a
new part, be sure to thoroughly clean the part to
remove the agent.
 Utilize matching marks when assembling.
 Be sure to use the designated tools to assemble
bearings, bushings and oil seals.
 Keep a record of the number of tools used for
disassembly/assembly. After assembling is
complete, count the number of tools, so as to
make sure that no forgotten tools remain in the
assembled machine.
Bleeding Air from Hydraulic System
When hydraulic oil is drained, the suction filter or the
suction lines are replaced, or the removal and in-
stallation of the pump, swing motor, travel motor or
cylinder is done, bleed air from the hydraulic system
in the following procedures:
IMPORTANT: If the engine is started with air
trapped in the hydraulic pump
housing, damage to the pump may
result. If the hydraulic motor is op-
erated with air trapped in the hy-
draulic motor housing, damage to
the motor may result.
If the cylinder is operated with air
trapped in the cylinder tube, dam-
age to the cylinder may result.
Be sure to bleed air before starting
the engine.
Bleeding Air from Hydraulic Pump
 Remove the air bleeding plug from the top of the
pump and fill the pump housing with hydraulic oil.
 After the pump housing is filled with hydraulic oil,
temporarily tighten the plug. Then, start the en-
gine and run at slow idle speed.
 Slightly loosen the plug to bleed air from the
pump housing until hydraulic oil oozes out.
 After bleeding all the air, securely tighten the
plug.
Bleeding Air from Travel Motor / Swing Motor
 With the drain plug / hose on travel motor / swing
motor removed, fill the motor case with hydraulic
oil.

GENERAL / Precautions for Disassembling and Assembling
W1-1-3
Bleeding Air from Hydraulic Circuit
 After refilling hydraulic oil, start the engine. While
operating each cylinder, swing motor and travel
motor evenly, operate the machine under light
loads for 10 to 15 minutes. Slowly start each op-
eration (never fully stroke the cylinders during ini-
tial operation stage). As the pilot oil circuit has an
air bleed device, air trapped in the pilot oil circuit
will be bled while performing the above operation
for approx. 5 minutes.
 Reposition the front attachment to check hydrau-
lic oil level.
 Stop the engine. Recheck hydraulic oil level. Re-
plenish oil as necessary.
M1CC-07-002

GENERAL / Precautions for Disassembling and Assembling
W1-1-4
Floating Seal Precautions
1. In general, replace the floating seal with a new
one after disassembling.
If the floating seal is to be reused, follow these
procedures:
(1) Keep seal rings together as a matched set
with seal ring faces together. Insert a piece of
cardboard to protect surfaces. Apply oil to the
sliding surface (C) on seal ring (A).
(2) Check the slide surface (C) on seal ring (A) for
scuffing, scoring, corrosion, deformation or
uneven wear.
(3) Check O-ring (B) for tears, breaks,
deformation or hardening.
2. If incorrectly assembled, oil leakage or damage
will occur. Be sure to do the following, to prevent
trouble.
(1) Clean the floating seal and seal mounting
bores with cleaning solvent.
Use a wire brush to remove mud, rust or dirt.
After cleaning, thoroughly dry parts with
compressed air.
(2) Clean the floating seal and seal mounting
bores. Check the bore surface for scuffing or
scoring by touching the surface.
(3) Check that the O-ring is not twisted, and that it
is installed correctly on the seal ring.
(4) After installing the floating seal, check that
seal ring surface (C) is parallel with seal
mating face (D) by measuring the distances
(C) and (D) at point (a) and (b), as illustrated.
If these distances differ, correct the O-ring
seating.
W105-03-05-019
W105-03-05-020
W110-03-05-004
a b
b b
aa
a=b
D
C
Incorrect Correct
Incorrect
Correct
A
B

GENERAL / Precautions for Disassembling and Assembling
W1-1-5
Precautions for Using Nylon Sling
1. Follow the precautions below to use nylon slings
safely.
 Attach protectors (soft material) on the corners of
the load so that the nylon sling does not directly
contact the corners. This will prevent the nylon
sling from being damaged and the lifted load from
slipping.
 Lower the temperature of the lifted load to lower
than 100 C (212 F). If unavoidably lifting a load
with a temperature of 100 C (212 F) or more,
reduce the load weight.
 Do not lift acid or alkali chemicals.
 Take care not to allow the sling to become wet.
The load may slip.
 When required to use more than one sling, use
slings with the same width and length to keep the
lifted load balanced.
 When lifting a load using an eyehole, be sure to
eliminate any gaps between the sling and load.
(Refer to the right illustration.) Reduce the load
weight so that it is less than 80 % of the sling
breaking force.
 Avoid using twisted, bound, connected, or
hitched slings.
 Do not place any object on twisted or bent slings.
(Refer to the right illustration.)
 When removing the slings from under the load,
take care not to damage the nylon slings. Avoid
contact with protrusions.
 Avoid dragging slings on the ground, throwing
slings or pushing slings with a metal object.
 When using with other types of slings (wire rope)
or accessories (shackle), protect the joint so that
the nylon sling is not damaged.
 Store the nylon slings indoors so they wont dete-
riorate with heat, sun light, or chemicals.
W102-04-02-016
W105-04-01-008
W162-01-01-009
Correct Eyehole
Lifting Method
Incorrect Eyehole
Lifting Method
Bent Sling

GENERAL / Precautions for Disassembling and Assembling
W1-1-6
CAUTION: If a load is lifted with a damaged
nylon sling, serious personal injury may re-
sult. Be sure to visually check the nylon sling
for any damage before using.
2. Before using a nylon sling, visually check the ny-
lon sling for any damage corresponding to exam-
ples shown to the right. If any damage is found,
cut and discard the sling. Even if no damage is
found, do not use slings older than 7-years.
Damaged Appearance
W162-01-01-002
W162-01-01-003
W162-01-01-004
W162-01-01-005
W162-01-01-006
W162-01-01-007
W162-01-01-008
Broken Sewing Thread
Scuffing
Broken Sewing
Thread
Fuzz
Broken Sewing
Thread
Separation of
Belt
Broken Sewing
Thread
Scuffing
Scoring
Broken Warp
Fuzz

GENERAL / Precautions for Disassembling and Assembling
W1-1-7
MAINTENANCE STANDARD TERMINOLO-
GY
Standard
1. Dimension for parts on a new machine.
2. Dimension of new components or assemblies
adjusted to specification.
Allowable Limit
1. Normal machine performance cannot be accom-
plished after exceeding this limit.
2. Repair or adjustment is impossible after exceed-
ing this limit.
3. Therefore, in consideration of operation efficiency
and maintenance expense, proper maintenance
shall be carried out before reaching the Allow-
able Limit.

GENERAL / Tightening
W1-2-1
TIGHTENING TORQUE SPECIFICATIONS
Bolt Dia Wrench
Size Torque
No. Descriptions
mm
Qty
mm N m (kgf m) (lbf ft)
1 Engine cushion rubber mounting bolt 14
16
2
2
22
24
180
270
(18.4)
(27.5)
(133)
(200)
2 Engine bracket mounting bolt 10
12
8
8
17
19
50
90
(5.1)
(9.2)
(37)
(66)
3 Hydraulic oil tank mounting bolt 16 4 24 270 (27.5) (200)
4 Fuel tank mounting bolt 16 4 24 210 (21.5) (155)
17 2.5 (2) (15)
19 29.5 (3) (22)
22 39 (4) (29)
27 93 (9.5) (69)
32 137 (14) (101)
36 175 (18) (129)
5 ORS fittings for hydraulic hoses and piping
41 205 (21) (151)
6 Pump mounting bolt 18 2 27 300 (30.5) (220)
7 Control valve mounting bolt 14 3 22 180 (18.4) (133)
ZX70-3, 70LC-3, 70LCN-3 12 4 19 90 (9.2) (66)
8 Control valve bracket
mounting bolt ZX75US-3, 85US-3 14 4 22 140 (14.3) (103)
9 Swing device mounting bolt 16 10 24 210 (21.5) (155)
10 Swing motor mounting bolt 14 8 12 175 (18) (129)
11 Battery mounting nut 10 4 17 20 (2.0) (15.0)
12 Cab mounting nut 16 4 24 210 (21.5) (155)
Swing bearing mounting bolt to upperstructure 16 24 24 210 (21.5) (155)
13 Swing bearing mounting bolt to undercarriage 16 24 24 270 (27.5) (200)
Travel device mounting bolt 16 20 24 300 (31) (220)
14 Travel reduction device cover mounting bolt 14 8 22 140 (14.3) (103)
15 Sprocket mounting bolt 16 24 24 270 (27.5) (200)
16 Upper roller mounting bolt 14 2 22 140 (14.3) (103)
17 Lower roller mounting bolt 14 40 22 245 (25) (180)
ZX70-3, 70LCN-3 14 304 22 245 (25) (180)
18 Track shoe bolt ZX70LC-3, 75US-3, 85US-3 14 320 22 245 (25) (180)
19 Cover mounting bolt
6
18
10
12
10
13
17
19
10
20
50
90
(1)
(2)
(5.1)
(9.2)
(7.4)
(15)
(37)
(66)
20 Flexible master coupling of low pressure piping 8 4 13 10.3 to 12.4 (1.05 to 1.26) (7.6 to 9.1)
Coupling of low pressure piping 4 9.5 4.4 (0.45) (3.3)
Suction hose 2 11 10 (1.0) (7.4)
In-take air duct 1 9.5 7.3 (0.74) (5.4)
21 T-bolt clamp of low
pressure piping Radiator hose 1 9.5 7.3 (0.74) (5.4)
22 Side-cutter mounting bolt 20 6 30 540 (55) (400)
NOTE: 1. Apply lubricant (e.g. white zinc B dis-
solved into spindle oil) to bolts and nuts
to reduce friction coefficient of them.
2. Make sure bolt and nut threads are
clean before installing.

GENERAL / Tightening
W1-2-2
TORQUE CHART
CAUTION: Use tools appropriate for the
work to be done. Makeshift tools and proce-
dures can create safety hazards. For loos-
ening and tightening nuts and bolts, use cor-
rect size tools. Otherwise, tightening tools
may slip, potentially causing personal injury.
Bolt Types
Tighten nuts or bolts correctly to torque specifications.
Four different types and grades of bolt are employed.
Make sure to employ correct bolts and tighten them
correctly when assembling the machine or compo-
nents.
SA-040
M552-07-091
Socket Bolt
M552-07-090
M552-07-092
Bolt Dia. Wrench
Size
Hexagon
Wrench
Size
N m (kgf m) (lbf ft) N m (kgf m) (lbf ft) N m (kgf m) (lbf ft)
M6 10 5 3.3 to 4.2 (0.3 to 0.4) (2.4 to 3.0)
M8 13 6 30 (3.0) (21.5) 20 (2.0) (14.5) 10 (1.0) (7.2)
M10 17 8 65 (6.5) (47) 50 (5.0) (36) 20 (2.0) (14.5)
M12 19 10 110 (11) (80) 90 (9.0) (65) 35 (3.5) (25.5)
M14 22 12 180 (18) (130) 140 (14) (101) 55 (5.5) (40)
M16 24 14 270 (27) (195) 210 (21) (152) 80 (8.0) (58)
M18 27 14 400 (40) (290) 300 (30) (215) 120 (12) (87)
M20 30 17 550 (55) (400) 400 (40) (290) 170 (17) (123)
M22 32 750 (75) (540) 550 (55) (400) 220 (22) (159)
M24 36 950 (95) (690) 700 (70) (510) 280 (28) (205)
M27 41 1400 (140) (1010) 1050 (105) (760) 400 (40) (290)
M30 46 1950 (195) (1410) 1450 (145) (1050) 550 (55) (400)
M33 50 2600 (260) (1880) 1950 (195) (1410) 750 (75) (540)
M36 55 3200 (320) (2310) 2450 (245) (1770) 950 (95) (690)

GENERAL / Tightening
W1-2-3
IMPORTANT: The following items are applied to
both fine and coarse pitch threads.
1. Apply lubricant (i. e. white zinc B
dissolved Into Spindle oil) to
nuts and bolts to reduce their
friction coefficients.
The plated bolts require no lu-
bricant.
2. Torque tolerance is 10 %.
3. Be sure to use bolts of correct
length. Bolts that are too long
cannot be tightened, as the bolt
tip comes into contact with the
bottom of the bolt hole. Bolts
that are too short cannot develop
sufficient tightening force.
4. The torques given in the chart
are for general use only. Do not
use these torques if a different
torque is given for a specific ap-
plication.
5. Make sure that nut and bolt
threads are clean before install-
ing.
Remove dirt or corrosion, if any.
Bolt Tightening Order
When tightening two or more bolts, tighten them al-
ternately, as shown, to ensure even tightening.
W105-01-01-003
1
6
4
2
3
Equally tighten upper and lower alternately Tighten diagonally Tighten from center and diagonally
1st to 4th
2nd to 3rd
13 11 10
14
12
7
6 1 4
3 2 58
9
5

GENERAL / Tightening
W1-2-4
Service Recommendations for Spilt Flange
IMPORTANT: 1. Be sure to clean and Inspect
sealing surfaces. Scratches /
roughness cause leaks and seal
wear.
Unevenness causes seal extru-
sion. If defects cannot be pol-
ished out, replace the compo-
nent.
2. Be sure to use only specified
O-rings. Inspect O-rings for any
damage. Take care not to file
O-ring surfaces. When installing
an O-ring into a groove, use
grease to hold it in place.
3. While lightly tightening split
flange halves, check that split is
centered and perpendicular to
the port. Hand-tighten bolts to
hold parts in place. Take care not
to pinch the O-ring.
4. Tighten bolts alternately and di-
agonally, as shown, to ensure
even tightening.
5. Do not use air wrenches. Using
an air wrench often causes tight-
ening of one bolt fully before
tightening of the others, result-
ing in damage to O-rings or un-
even tightening of bolts.
Nut and Bolt Locking
Lock Plate
IMPORTANT: Do not reuse lock plates. Do not try
to bend the same point twice.
Cotter Pin
IMPORTANT: Do not reuse cotter pins. Match the
holes in the bolt and nut while tight-
ening, not while loosening.
Lock Wire
IMPORTANT: Apply wire to bolts in the
bolt-tightening direction, not in the
bolt-loosening direction.
W105-01-01-015
W105-01-01-016
W105-01-01-008
W105-01-01-009
W105-01-01-010
Bend along edge sharply Do not bend it round
Bend along edge sharply
Loosen
Tighten
Incorrect
Correct Incorrect
Correct Correct Incorrect
Correct Correct
Correct Incorrect
Incorrect

GENERAL / Tightening
W1-2-5
PIPING JOINT
IMPORTANT: The torques given in the chart are
for general use only.
Do not use these torques if a differ-
ent torque is given for a specific ap-
plication.
Union Joint
Metal sealing surfaces (4) and (5) of adapter (1) and
hose (2) fit together to seal pressure oil. Union joints
are used to join small-diameter lines.
IMPORTANT: 1. Do not over-tighten nut (3). Ex-
cessive force will be applied to
metal sealing surfaces (4) and (5),
possibly cracking adapter (1). Be
sure to tighten nut (3) to specifi-
cations.
2. Scratches or other damage to
sealing surfaces (4) or (5) will
cause oil leakage at the joint.
Take care not to damage them
when connecting/disconnecting.
M202-07-051
W105-01-01-017
Wrench Size
mm
Wrench Size
mm Tightening Torque Description
Union Nut Hose Fittings N m (kgf m, lbf ft)
30 male 17 17 24.5 (2.5, 18)
19 19 29.5 (3.0, 21.5)
22 22 39 (4.0, 28.5)
27 27 93 (9.5, 69)
32 32 137 (14.0, 101)
36 36 175 (18.0, 129)
41 41 205 (21.0, 151)
37 female 17 14 24.5 (2.5, 18)
19 17 29.5 (3.0, 21.5)
22 19 39 (4.0, 28.5)
27 22 93 (9.5, 69)
32 27 137 (14.0, 101)
36 32 175 (18.0, 129)
41 36 205 (21.0, 151)
NOTE: Tightening torque of 37 male coupling without union is similar
to tightening torque of 37 female.
37
30
Female Union JointMale Union Joint
13 5 2
Joint Body
4