Tadano TM-2000-1 User manual

Publication No. TM-2000-1/S1(U)-1E
01
Boom Truck
TM-2000- 1
Applicable Serial No. EX0069～
Model
Service Manual TM-2000-1/S1(U)-1E
◯
ｃ2006
PRINTED IN JAPAN
0609 K

Safet
y
1 WA01-0041E
Safety
Most accidents that occur during machine operation
and maintenance are caused by failure to observe
basic safety rules and precautions. Before operating
your machine or performing maintenance, read and
become familiar with all the safety precautions and
recommendations given in this section.
Remember that failure to observe even a single
precaution could involve you and the people around
the machine in a serious accident.
Foreseeing potential dangers is vital for preventing
accidents. All personnel working with the machine,
including the supervisor, machine operator and oiler,
should be sensitive to potentially dangerous situations
and take the necessary measures to prevent
accidents.
Safety precautions and recommendations are outlined
in this section and are also included in the operation
and maintenance instructions given in subsequent
sections. Warning labels are also provided on the
machine.
The cautionary instructions in this manual are
identified as "DANGER", "WARNING", "CAUTION" or
"NOTICE". These terms are defined as follows:
[NOTICE]
[NOTICE] indicates an important operational or
maintenance procedure or condition, which, if not
strictly observed, can result in damage to machine
components or deteriorated machine performance.
It is virtually impossible to anticipate every situation
that might present a hazard. The safety precautions
given in this manual and on the machine labels are
not exhaustive.
It is important, therefore, to strictly follow the
instructions in this manual and be sensitive to
potential dangers in order to prevent bodily injury and
damage to the machine.
Remember that your most important duty is to ensure
the safety of you, your co-workers and any other
people in the area.
DANGER indicates an imminently hazardous
situation, which, if not avoided, will result in death
or serious injury.
DANGER
WARNING indicates a potentially hazardous
situation, which, if not avoided, could result in
death or serious injury.
WARNING
CAUTION indicates a potentially hazardous
situation, which, if not avoided, may result in
a minor or moderate injury.
CAUTION

Safet
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2 WA01-0041E
1. Fundamental cautions
Servicemen inexperienced in the units of this machine
should be cautious about safety operations. They
must acquire sufficient knowledge about the
equipment before dismounting and disassembling it.
Before dismounting each component, a serviceman
should read this service manual thoroughly and find
out the weight of the component, then lift it by proper
means.
The following are cautions to be observed all the time.
1.Before starting repairs, find out the origin of the
problem. When it becomes clear that
disassembly and maintenance are necessary, first
of all read this manual and parts catalog and
thoroughly understand the principle of operation
and construction. Then carefully check and
examine each portion. Don't disassemble
portions unrelated to the problem. Unless taking
all possible measures before starting disassembly,
new troubles or decline in performance may be
induced.
2.Before operating the machine, oiling or repairing,
read warning labels and instructions on the
machine and understand the contents.
3.Wear a safety helmet and safety shoes whenever
you carry out maintenance operation around the
machine. Be sure to wear safety goggles when
you hit the machine or its attachments with a
hammer. In welding operation, wear safety gears
such as leather gloves, helmet, goggles, apron
and proper working clothes, but don't wear loose
or torn clothes. Take a ring and so on off your
finger when you conduct maintenance or repair.
4.Park the machine on as level and hard ground as
possible. Place chocks under wheels to prevent
the vehicle from moving when doing maintenance
on or below the machine.
5.Before starting maintenance, remove cables to the
battery and allow the capacitors to discharge.
Pull out the ignition key and hang a tag saying,
"Don't start the engine." in the cab.
6.Don't carry out maintenance while lifting the
vehicle with only a jack or a hoist. Sustain the
vehicle positively with blocks and so on to prevent
fatal accidents, as there is a possibility that the
vehicle loses its balance and falls down on a
worker in a dismounting process of certain units.
7.When the working is done on a team of more than
one person, make arrangements about
co-operation and communication between workers
beforehand. Give a sign without fault and make
sure that the sign has been transmitted to other
workers before starting the next operation.
8.When it is inevitable to measure oil pressure,
rotational speed, and temperature for machine
inspection without stopping the engine, be careful
not to be caught or pinched in rotating or moving
parts such as a fan, fan belt. Make sure that
there is no obstruction or no person around the
machine before operating it.
2. Cautions in working
2.1 General
1.When hoisting up components weighing more than
20 kg, use hoist or the like to prevent injury to your
lumbar or spine. For specific components, their
weights are listed on the chapter for "service data"
in this manual.
2. When using eyebolts, lift parts vertically so that
only tension is applied to them.
3.Protect wire ropes and plastic lifting slings by
covering corners with pads so that they are not
bent sharply by directly contacting corners.
Keep the sling angle of wire ropes within 60°and
as vertical as possible.
4.Be careful about hot or heated portions when
conducting repair or maintenance just after the
vehicle has stopped or the machine operation has
been finished or interrupted.
5.When hitting parts, be sure to either hit on a pad
placed on the parts or use a plastic hammer.
6.Put units, especially similar parts, in order. Mark
them with tags or marker if necessary.

Safet
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3 WA01-0041E
7.Put disassembled parts in order so that parts such
as bolts are not left behind in the machine. And
check that no parts run short at assembly.
8.Watch your step in the following cases:
When stepping up to or stepping down from the
upper surface of a boom for replacing wire ropes
and applying grease. Be careful not to stumble
on protrusions on the upper surface of a boom.
When greasing at the root of a elevating cylinder
When checking engine oil, radiator coolant, or
battery fluid.
When replacing a filter of air cleaner
When getting on and off the cab
Be careful not to slip in the above operations in
winter as snow and ice may attach to the exterior
of boom and it becomes very slippery.
2.2 Dismounting and disassembling
1.Before dismounting and disassembling, make sure
of the construction and part sales unit by reading
this manual and the separate parts catalog, then
understand the procedures of dismounting and
remounting and disassembling and reassembling.
2.When dismounting piping or equipment that may
contain pressurized oil or air, be extremely
cautious and dismount them only after discharging
the confined pressure.
3.Before removing, clean the part to be dismounted
and the area surround it. Seal the opening with a
plug or tape, etc. to prevent foreign material from
entering it.
4.Measure and record the data such as shim
thickness adjustment and pre-load at disassembly
that will be required at reassembly.
5.If required, before disassembling clearly put marks
to avoid errors at reassembling.
6.If a part cannot be removed after removing bolts or
nuts fixing it, don't apply too much force to it but
check the part for the cause. Only after relieving
the cause, proceed disassembling.
7.Use lifting slings appropriate for the weight and
characteristics of a part. Lift up it in balanced
condition.
In case that the position of the center of gravity is
not clear and there is a possibility of swing of load
after removing, use two hoists.
8.If a part cannot be lifted smoothly, make sure that
all the fasteners are removed and other parts don't
hinder removing.
2.3 Remounting and assembling
1.Before assembling, clean all the parts and repair
or replace defective parts.
2.As dirt and soil adversely affect sliding portions
and they may decrease the life of the machine,
pay special attention to avoid intrusion of dirt and
soil.
3.Use special tools for parts when specified to do so.
4.Remove dirt, soil, water, and resin completely from
surfaces where liquid gasket will be applied.
5.After remounting, be sure to inspect the machine
and verify that there is no error by oversight. If
adjustment or air bleeding is required, conduct it
according to instructions. Conduct function and
performance test to verify its integrity.
3. Cautions in operation
3.1 Brake fluid replenishment
1.When the brake-warning lamp (for fluid level) is
lighted, replenish brake fluid and check and make
sure of the thickness of disk brake pads. (Refer
to Chapter Y for periodical inspection periods.)
2.Check the thickness of disk brake pads whenever
brake fluid is replenished.
3.2 Handling of battery
1.Erroneous handling of a battery may cause it to
catch fire and explode.
Be extremely sure to avoid short circuits, sparks
and fire of cigarettes and the like when using a
jumper cable. They are very dangerous.
Charge up batteries and use them only in well
ventilated places.

Safet
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4 WA01-0041E
2.Battery fluid (dilute sulfuric acid) may cause loss of
sight or burn injury.
If battery fluid stains an eye, skin, or clothes,
immediately wash down them with a great deal
of water.
If battery fluid enters into an eye, immediately
wash it down with water and see a doctor for
medical aid.
3.When removing terminals, remove the minus (－)
terminal first. When connecting terminals,
connect minus (－) terminal last.
3.3 Handling of radiator
1.Don't open the radiator cap while the coolant is still
hot.
2.Check the coolant at the reservoir tank.
3.If high-pressure water is used for radiator cleaning,
fins may be damaged.
3.4 Cooling fan
1.Stop the engine completely before checking the
tension of the engine fan belt.
2.The oil cooler fan may rotate the moment the
engine is started. Be sure to pull out the ignition
key before accessing the cooling fan.
4. About waste disposal
1.Waste oils, used filters, and other such
petrochemical-related products, if disposed of
thoughtlessly, will cause environmental
contamination.
2.Obtain a proper-sized vessel before releasing
waste oils from the machine. Never discharge
waste oils on the ground or into rivers, lakes or
marshes.
3.Follow all governing environmental rules and
regulations when disposing of oils, fuels, cooling
water, brake fluid, solvents, filters, batteries or any
other damaging substances.
4.1 Gasoline
1.Spill or leak: Review fire and explosion hazards
before proceeding with clean up. Use appropriate
personal protective equipment during clean up.
Dike spill. Prevent liquid from entering sewers,
waterways, or low areas. Soak up with sawdust,
sand, oil dry or other absorbent material. Shovel or
sweep up.
2.Remove source of heat, sparks, flame, impact,
friction or electricity including internal combustion
engines and power tools. If equipment is used for
spill cleanup, it must be explosion proof and
suitable for flammable liquid and vapor.
Note: Vapors released from the spill may create an
explosive atmosphere.
3.Waste disposal method: Treatment, storage,
transportation and disposal must be in accordance
with applicable federal, state, provincial, and local
regulations. Do not flush to surface water or
sanitary sewer system.
4.By itself, the liquid is expected to be a RCRA
ignitable hazardous waste.
4.2 Hydraulic oil
1.Spill of leak: Contain spill immediately in smallest
area possible. Recover as much of the product
itself as possible by such methods as vacuuming,
followed by soaking up of residual fluids by use of
absorbent materials. Remove contaminated items
including contaminated soil and place in proper
containers for disposal. Avoid washing, draining or
directing material to storm or sanitary sewers.
2.Waste disposal method: Recycle as much of the
recoverable product as possible. Dispose of
nonrecyclable material as a RCRA hazardous
waste by such methods as incineration, complying
with federal, state, and local regulations.
4.3 Motor oil
See HYDRAULIC OIL above.

Foreword
1 WA04-2140E
Foreword
This manual contains information on the systems
and components of TM-2000-1 series cranes.
It also contains repair, inspection, and adjustment
procedures for those systems and components.
To be sure of performing repair and service
operations correctly ,read this manual in conjunction
with the separate operation and maintenance
manual and the separate parts catalog.
Whenever a part need to be replaced, check the
part sales unit in the parts catalog.
1. Applicable unit No.
Boom nameplate
(1) Unit No.
(2) Lot No.
UNI T NO. LOT NO.
IWA04-062001
(1)
(2)
Frame nameplate
(1) Unit No.
(2) Serial No.
(3) Date of mounting
SPEC. NO. SERIAL. NO.
MF G . DA T E .
IWA04-062002
KAGAWA,JAPAN
(1)
(2)
(
3
)
1.1 Unit No. of the TM-2000-1 series
Spec. Boom nameplate
unit No.
Frame nameplate
unit No.
TM-2000-1-104 411-431-10010
TM-2000-1-114 411-431-10020
TM-2000-1-204 411-431-10050
TM-2000-1-214 411-431-10060
TM-2000-1-304 411-431-10030
TM-2000-1-314 411-431-10040
TM-2000-1-404 411-431-10070
TM-2000-1-414
411-431-20040
411-431-10080
2. Separate service manual
Separate service
manual Publication No.
General Caution SA01-01-2E
Please note that, for product improvement, some
changes may have been incorporated in the
machine that are not covered in this manual.

2 WA04-2140E
Foreword
3. Outline of specifications
Spec. No.
Item TM-2000-1
-104 TM-2000-1 -304 TM-2000-1 -114 TM-2000-1 -314 TM-2000-1 -204 TM-2000-1 -214 TM-2000-1 -404 TM-2000-1 -414
No. of boom
sections 5-section
Winch Hydraulic motor driven, planetary gear speed reduction, provided with automatic brake
Outriggers
extended width Min.7.15’ Mid.13.1' Max.18.7'
Crane mount
position Cab back mount Rear mount
Rear stabilizers
extended width Min.7.38’ Max.11.48' –
Front outriggers
extended width – Min.7.15’ Mid.13.1' Max.18.7'
Swing Non-continuous 375°
rotation Continuous rotation Non-continuous 375°
rotation Continuous rotation
Operation Manual Radio
remote
controls Manual Radio
remote
controls Manual Radio
remote
controls Manual Radio
remote
controls
Safety devices
Anti-two-block with alarm
Hook safety latch
Level gauge
Hydraulic safety valves, check valves and holding valves
Over load shutoff with load indicator
Load / Boom angle indication
Audible warning
External warning lamps

3 WA04-2140E
Foreword
4. Conversion table
Length
millimeter, mm centimeter, cm meter, m inch, in, ” foot, ft, ’ mile, mi kilometer, km
1 0.1 0.001 0.03937 0.00328 1 1.6093
10 1 0.01 0.3937 0.03281 0.6214 1
1000 100 1 39.37 3.281 – –
25.4 2.54 0.0254 1 0.08333 – –
304.8 30.48 0.3048 12 1 – –
Area
square millimeter, mm2square centimeter, cm2square meter, m2square inch, in2square foot, ft2
1 0.01 0.000001 0.00155 -
100 1 0.0001 0.155 0.001076
1000000 10000 1 1550 10.764
645.2 6.452 0.000645 1 0.006944
92903 929.03 0.0929 144 1
Volume
cubic
centimeter,
cm3, cc cubic meter, m3cubic inch, in3cubic foot, ft3gallon,
gal cubic inch, in3liter, lit, L
1 0.000001 0.0610 0.0000353 1 231 3.785
1000000 1 61024 35.31 0.004329 1 0.01639
16.39 0.0000164 1 0.000579 0.2642 61.02 1
28320 0.02832 1728 1 – – –
Mass
gram, g kilogram, kg ounce, oz pound, lb metric ton, ton, t short ton, s. t
1 0.001 0.03527 0.0022 – –
1000 1 35.27 2.205 0.001 0.001102
28.349 0.02835 1 0.0625 0.00002835 0.00003125
453.592 0.4536 16 1 0.0004536 0.0005
1000000 1000 35274 2205 1 1.102
907185 907.2 32000 2000 0.9072 1
Pressure
Pa kPa MPa kgf/cm2lb/in2, psi
1 1×10-3 1×10-6 1.01972×10-5 14.5×10-5
1×1031 1×10-3 1.01972×10-2 14.5×10-2
1×1061×1031 1.01972×10 14.5×10
9.80665×1049.80665×10 9.80665×10-2 1 14.22
6895 6.895 0.006895 0.07031 1

4 WA04-2140E
Foreword
Torque
N-cm N-m kgf-cm kgf-m foot-pound, ft-lb
inch-pound,
in-lb
1 1×10-2 1.01972×10-1 1.01972×10-3 0.00737 0.0885
1×1021 1.01972×10 1.01972×10-1 0.7376 8.851
9.80665 9.80665×10-2 1 1×10-2 0.0723 0.868
9.80665×1029.80665 1×1021 7.233 86.8
135.58 1.3558 13.83 0.1383 1 12
11.3 0.113 1.1525 0.01153 0.08333 1
Centigrade-Fahrenheit
°F °C °F °C °F °C °F °C °F °C °F °C
-90 -67.78 -40 -40 10 -12.22 60 15.56 110 43.33 160 71.11
-80 -62.22 -30 -34.44 20 -6.67 70 21.11 120 48.89 170 76.67
-70 -56.67 -20 -28.89 30 -1.11 80 26.67 130 54.44 180 82.22
-60 -51.11 -10 -23.33 40 4.44 90 32.22 140 60 190 87.78
-50 -45.56 0 -17.78 50 10 100 37.78 150 65.56 200 93.33
Conversion equation: t°C =5(T°F -32)/9, T°F =(9×t°C +160)/5
Force
N kgf lbf
1 1.01972×10-1 2.24809×10-1
9.80665 1 2.20461
4.44822 0.45359 1

5 WA04-2140E
Outrigger System
Swing System
Boom Elevating System
Winch System
Boom Telescoping System
Safety System
Radio-control System
System Diagrams
Data, Adjustment and Checks
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Y
Z
A
GROUP INDEX
Hydraulic Power Generating System

6 WA04-2140E
Foreword
5. Contents
Spec. No. TM-2000-1
Chapter Section
-104 -304 -114 -314 -204 -214 -404 -414
General
A General Cautions Refer to separate manual
SA01-01-2E
Hydraulic Pressure Generating System
Manual Control Valve(Boom elevating,
telescoping, swing, outrigger, high / low
shift) B-1
Manual Control Valve (Outrigger) B-2
Manual Control Valve (Winch) B-3
Hydraulic Pump B-4
Sequence Valve (Pilot pressure) B-5
Solenoid Valve (Auto stop) B-6
Solenoid Valve (Winch high speed and
swing brake) B-7
Solenoid Valve (Winch unload) B-8
Solenoid Valve (Outrigger select) B-9
Pressure Regulator Valve (Outrigger) B-10
Hydraulic Valve B-11
Shuttle Valve B-12
Rotary Joint – B-13 – B-13
B
Outrigger System
Jack Cylinder (Front and rear stabilizer) C-1 –
C
Jack Cylinder (Outrigger and front
outrigger) C-2

7 WA04-2140E
Foreword
Spec. No. TM-2000-1
Chapter Section
-104 -304 -114 -314 -204 -214 -404 -414
Pilot Check Valve (Front and rear
stabilizer) C-3 –
Pilot Check Valve (Outrigger jack and
front outrigger jack) C-4
Power Slide Cylinder (Outrigger and front
outrigger) C-5
Power Slide Cylinder (Rear stabilizer) C-6 –
Relief Valve (Front stabilizer) C-7 –
Pressure Sensor (Front stabilizer) C-8 –
C
Swing System
Hydraulic Motor (Swing) D-1
Swing Speed Reducer D-2
Swing Bearing D-3
D
Boom Elevating System
Boom Elevating Cylinder E-1
Counterbalance Valve (Elevating) E-2
E
Winch System
Winch F-1
Hydraulic Motor (Winch) F-2
Counterbalance Valve (Winch) F-3
F

8 WA04-2140E
Foreword
Spec. No. TM-2000-1
Chapter Section
-104 -304 -114 -314 -204 -214 -404 -414
Boom Telescoping System
General description of telescoping
system G-1
Boom (Five-section boom) G-2
Telescoping Cylinder G-3
Counterbalance Valve (Telescoping) G-4
G
Safety Devices
AMA (Load moment indicator) H-1
Boom Length / Angle Detector H-2
Outrigger extension detector H-3
H
Radio-control System
Configurations of Radio-control System – V-1 – V-1 – V-1 – V-1
Radio-control Valve –V-2 –V-2 –V-2 –V-2
Accelerator Cylinder –V-3 – V-3 – V-3 – V-3
Measures for Emergency Case –V-4 –V-4 –V-4 –V-4
V
Data, Adjustment and Checks
Service Data Y-1
Adjustment and Checks Y-2
Y

9 WA04-2140E
Foreword
Spec. No. TM-2000-1
Chapter Section
-104 -304 -114 -314 -204 -214 -404 -414
System Diagrams
Hydraulic Circuit
(Spec. No.: TM-2000-1-104, 114, 204,
214) Z-1
Hydraulic Circuit
(Spec. No.: TM-2000-1-304, 314, 404,
414) Z-2
Electric Circuit
(Spec. No.: TM-2000-1-104, 204) Z-3
Electric Circuit
(Spec. No.: TM-2000-1-114, 214) Z-4
Electric Circuit
(Spec. No.: TM-2000-1-304, 404) Z-5
Electric Circuit
(Spec. No.: TM-2000-1-314, 414) Z-6
Location of Hydraulic Parts Z-7
Location of Electrical Parts Z-8
Z

i
B
Hydraulic Power Generating System
Contents
B-1 Manual Control Valve (Boom
elevating, telescoping, swing,
outrigger, high/low shift).................1
1. Structure................................................... 1
B-2 Manual Control Valve
(Outrigger)................................7
1. Structure................................................... 7
B-3 Manual Control valve
(Winch)...................................11
1. Structure..................................................11
B-4 Hydraulic Pump..............................13
1. Structure.................................................... 13
B-5 Sequence Valve
(Pilot pressure)......................14
1. Structure................................................. 14
B-6 Solenoid Valve
(Auto stop).............................17
1. Structure................................................. 17
B-7 Solenoid Valve (Winch high speed
& swing brake).......................19
1. Structure ................................................. 19
B-8 Solenoid Valve
(Winch unload).......................21
1. Structure ................................................. 21
B-9 Solenoid Valve
(Outrigger select)...................22
1. Structure ................................................. 22
B-10Pressure Regulator Valve
(Outrigger)..............................24
1. Structure ................................................. 24
B-11Hydraulic Valve ..............................25
1. Structure ................................................. 25
B-12Shuttle Valve...................................26
1. Structure ................................................. 26
B-13Rotary Joint....................................27
1. Structure ................................................. 27
B

B-1 B-1
Manual Control Valve(Boom elevating, telescoping, swing, outrigger, high/low shift)
1 W113-0400E
B-1 Manual Control Valve
(Boom elevating, telescoping, swing, outrigger, high/low shift)
[NOTE]
There is a case that the appearance and so on differ from the parts for this crane. Although there is not so
much difference in functions and disassembly procedures, make sure of the serial number of this crane and
the parts sales unit described in the parts catalog before starting disassembling operations.
1. Structure
Thread size and tightening torque
Tightening torque
Sign / Port Thread size N-m ft-lbf
A1 – A4
B1 – B4
P1 G1/2 58.8 – 68.6 43.3 – 50.5
P2 G3/8 39.2 – 49.0 28.9 – 36.1
T G1 98.1 – 117.7 72.3 – 86.8
G1 – G3 G1/4 24.5 – 29.4 18.0 – 21.6
General View

B-1 B-1
Manual Control Valve(Boom elevating, telescoping, swing, outrigger, high/low shift)
2 W113-0400E
1. Body assy
2. Valve (Swing)
3. Body assy
4. Valve (Elevation)
5. Valve (Telescoping)
6. Valve (Confluence)
7. Plate
8. O-ring
9. O-ring
10. Relief valve (RV1)
11. Relief valve (RV2)
12. Relief valve (RV3)
13. Relief valve (PR1)
14. Stud bolt
15. Nut
22. Plug
23. O-ring
Cross section
Body assy

B-1 B-1
Manual Control Valve(Boom elevating, telescoping, swing, outrigger, high/low shift)
3 W113-0400E
11. Relief valve (RV2)
12. Relief valve (RV3)
22. Plug
23. O-ring
33. Check valve
34. Spring
35. Retainer
36. O-ring
37. Oil seal
38. Retainer
39. Retainer
40. Spring
41. Spool end
42. Cover
43. Hexagon socket bolt
44. Hexagon socket bolt
52. Valve
53. Spring
54. Plug
55. O-ring
56. Screw
57. Screw
58. Valve
59. Spring
60. Retainer
61. Plug
62. O-ring
Valve
(Swing)
Body assy

B-1 B-1
Manual Control Valve(Boom elevating, telescoping, swing, outrigger, high/low shift)
4 W113-0400E
13. Relief valve (PR1)
33. Check valve
34. Spring
35. Retainer
36. O-ring
37. Oil seal
38. Retainer
39. Retainer
40. Spring
41. Spool end
42. Cover
43. Hexagon socket bolt
44. Hexagon socket bolt
45. Plug
77. O-ring
78. Retainer
79. Spring
80. Retainer
81. Rod end
82. Cover
83. Cover
84. Hexagon socket bolt
Valve
(Elevation)
Valve
(Confluence)
Valve
(Telescoping)

B-1 B-1
Manual Control Valve(Boom elevating, telescoping, swing, outrigger, high/low shift)
5 W113-0400E
10. Relief valve (RV1)
11. Relief valve (RV2)
62. O-ring
103.O-ring
104.Spring
105.Retainer
106.O-ring
107.O-ring
108.Body
109.Regulator valve
110.Spring
111.Screw
112.O-ring
113.Nut
114.Cap nut
128.Stopper
129.Retainer
137.O-ring
140.Backup ring
141.Backup ring
142.Backup ring
143.Backup ring
Relief valve (RV1)
Relief valve (RV2)