Download
Share
Print this page
Doosan 7/20 Manual
  1. Manuals
  2. Brands
  3. Doosan Manuals
  4. Air Compressor
  5. 7/20
  6. Manual

Doosan 7/20 Manual

Compressor training small compressors
Hide thumbs Also See for 7/20:

Advertisement

Quick Links

Download this manual
COMPRESSOR TRAINING
Small compressors
SMALL COMPRESSORS RANGE
• 7/20
- P65
- 7 bar (100 PSI), 1.9 m3/min (70 cfm)
• 7/26E
- P90
- 7 bar (100 PSI), 2.5 m3/min (90 cfm)
• 7/31E
- P110 - 7 bar (100 PSI), 3.0 m3/min (105 cfm)
• 7/41
- P135 -7 bar (100 PSI), 4.0 m3/min (140 cfm)
• 7/51
- XP185 -7 bar (100 PSI), 5.0 m3/min (175 cfm)
• 7/71
- P260
-7 bar (100 PSI), 7.1 m3/min (250 cfm)
• 12/56
-12 bar (170 PSI), 5.6 m3/min (200 cfm)
SUMMARY
• The compressor can be divided in the following subsystems
–
ENGINE & AIREND
–
LUBRICATION & COOLING SYSTEM
–
AIR FLOW REGULATION SYSTEM
–
SEPARATION SYSTEM
–
BLOWDOWN SYSTEM
–
INSTRUMENT/CONTROL PANEL
–
ELECTRICAL WIRING
•
Troubleshooting
Company Confidential
Company Confidential
10/12/2010
1

Advertisement

loading
Need help?

Need help?

Do you have a question about the 7/20 and is the answer not in the manual?

Questions and answers

Related Manuals for Doosan 7/20

Summary of Contents for Doosan 7/20

  • Page 1 10/12/2010 COMPRESSOR TRAINING Small compressors SMALL COMPRESSORS RANGE • 7/20 - P65 - 7 bar (100 PSI), 1.9 m3/min (70 cfm) • 7/26E - P90 - 7 bar (100 PSI), 2.5 m3/min (90 cfm) • 7/31E - P110 - 7 bar (100 PSI), 3.0 m3/min (105 cfm) •...
  • Page 2 10/12/2010 ENGINE (7/20) Compressor 7/20 IR Designation 3IRJ5N Model D 1005 Cylinders Displacement Rated Output (kW@RPM) 17.5@3000 Aspiration Naturally aspirated Mechanical inline Fuel Pump pump Emissions Tier II certified Electrics 12 Volts Company Confidential ENGINE Tier 2 (7/26E – 7/51)
  • Page 3 10/12/2010 ENGINE Tier 2 (7/71 – 12/56) 7/71 – 12/56 Compressor IR Designation 4IRD5N Model JD 4045DF270 Cylinders Displacement 4.5 liter Rated Output (kW@RPM) 60@2500 Aspiration Naturally Aspirated Fuel Pump Rotary fuel pump Emissions Tier II certified Electrics 12 Volts Company Confidential ENGINE Tier 3 (7/71 –...
  • Page 4 10/12/2010 ENGINE Tier 3 Improvements – YANMAR ECO Eco-Governor Fuel Pump Actuator Rack position Speed START Key Switch Switch Starting Aid Display CW Temp. Starter Accelerator Company Confidential ENGINE Tier 3 Improvements – YANMAR ECO EGR Control – exhaust gas re-circulation Standard Function for >= 37kW Speed, Load, &...
  • Page 5 10/12/2010 ENGINE Tier 3 Improvements – YANMAR ECO orifice Fuel injection pipe Injection pump Timer piston Fuel filter Plunger Thermo-element Distributor Engine coolant shaft Nozzle Accumulator Electric fuel feed pump joint Water separator Overflow Fuel return orifice tappet High pressure gallery Fuel tank Engine crankcase Engine...
  • Page 6 10/12/2010 AIREND (7/20) • Now used on 7/20 only, formerly used on 7/21 and 7/26. • Cast iron body. CE55RW - AIREND Company Confidential AIREND (7/20) • Now used on 7/20 only. • Formerly used on 7/21 and 7/26. Company Confidential AIREND (7/26E - 7/51) •...
  • Page 7 – Sealing the clearances between the airend rotors – Cooling of the airend. Heat is generated during air compression. • The oil flows due to the air pressure. No oil pump is required. Company Confidential LUBRICATION & COOLING (7/20) Company Confidential...
  • Page 8 10/12/2010 LUBRICATION & COOLING • The Separator tank is also the reservoir of compressor oil. • Pressure in the tank is forcing the oil through the system. Company Confidential LUBRICATION & COOLING • Cool box design with pusher type fan. Company Confidential LUBRICATION &...
  • Page 9 10/12/2010 LUBRICATION & COOLING • Compressor oil filter, 10 micron rating. Company Confidential LUBRICATION & COOLING (7/26E - 7/51) Company Confidential LUBRICATION & COOLING (7/26E - 7/51) • Oil filter head integrated to airend. Company Confidential...
  • Page 10 10/12/2010 LUBRICATION & COOLING (7/71 – 12/56) Company Confidential LUBRICATION & COOLING (7/71 – 12/56) Company Confidential LUBRICATION & COOLING (7/71 – 12/56) Company Confidential...
  • Page 11 • The unloader and fuel pump throttle are pneumatically (on mechanical engines) controlled through the pressure regulator. • On the new electronic Yanmar engines the regulation pressure signal is converted to a speed signal to the engine ECU. Company Confidential AIR FLOW & REGULATION (7/20) Unit stopped Company Confidential...
  • Page 12 10/12/2010 AIR FLOW & REGULATION (7/20) Start-up Service valve closed Company Confidential AIR FLOW & REGULATION (7/20) Air demand Service valve open Company Confidential AIR FLOW & REGULATION (7/20) Off load Service valve closed Company Confidential...
  • Page 13 10/12/2010 AIR FLOW & REGULATION (7/20) Fully open the service valve until full speed. Slowly close service valve until speed starts to decrease. Read tank pressure, this is the regulated pressure. Increase by tightening regulator screw B or decrease by un-tightening.
  • Page 14 • Controlled pressure preset in factory, can be adjusted by means of adjusting screw. • Pin hole allows to determine diaphragm condition. Company Confidential AIR FLOW & REGULATION (7/20) • Mechanical engine - Spring loaded piston - Air pressure increase reduces speed.
  • Page 15 10/12/2010 AIR FLOW & REGULATION (7/26E – 7/51) Air demand Service valve open Company Confidential AIR FLOW & REGULATION (7/26E – 7/51) Off load Service valve closed Company Confidential AIR FLOW & REGULATION (7/26E – 7/51) Company Confidential...
  • Page 16 10/12/2010 AIR FLOW & REGULATION (7/26E – 7/51) Company Confidential AIR FLOW & REGULATION (7/26E – 7/51) • Connection on compressor inlet allows to reduce noise. Regulation Orifice Company Confidential AIR FLOW & REGULATION (7/71 – 12/56) Start up Service valve closed Company Confidential...
  • Page 17 10/12/2010 AIR FLOW & REGULATION (7/71 – 12/56) Load button pressed Service valve closed Company Confidential AIR FLOW & REGULATION (7/71 – 12/56) Off load Service valve closed Company Confidential AIR FLOW & REGULATION (7/71 – 12/56) UL99 Unloader Company Confidential...
  • Page 18 10/12/2010 AIR FLOW & REGULATION (7/71 – 12/56) Regulation Orifice Company Confidential SEPARATION SYSTEM • Functions of the separation system: – Removing the oil contained in the compressed air • Most of the oil is removed from the air through a specially shaped baffle in the separator tank.
  • Page 19 10/12/2010 SEPARATION SCHEMATIC (7/20) Company Confidential SEPARATOR/RECEIVER TANK (7/20) Company Confidential SCAVENGE LINE (7/20) • Orifice is located in the elbow connector. • It is designed to scavenge the oil while limiting the loss of air flow. • Check valve prevents oil reverse flow during shutdown.
  • Page 20 10/12/2010 SCAVENGE LINE (7/20) • Returns to air inlet. • Look for clogged scavenge lines in case of oil carry over! Company Confidential SAFETY VALVE (7/20) • Valve is on the oil side of the element where pressure is maximum when the separator element is blocked.
  • Page 21 10/12/2010 SEPARATOR ELEMENT (7/20) • The scavenge tube is part of the separator element. Earth staple Company Confidential SEPARATION SCHEMATIC (7/26E – 7/51) Company Confidential SCAVENGE LINE (7/26E – 7/51) Scavenge Orifice Company Confidential...
  • Page 22 10/12/2010 SCAVENGE LINE (7/26E – 7/51) Scavenge Return Company Confidential SONIC ORIFICE (7/26E – 7/51) Company Confidential SEPARATION SCHEMATIC (7/71 – 12/56) Company Confidential...
  • Page 23 10/12/2010 SEPARATOR TANK (7/71 – 12/56) Company Confidential SCAVENGE LINE (7/71 – 12/56) Scavenge Return Scavenge Orifice Company Confidential SONIC ORIFICE (7/71 – 12/56) Company Confidential...
  • Page 24 • The blow down system allows to relieve the pressure from the separator tank automatically or manually if required. Company Confidential AUTO BLOWDOWN (7/20) • Normally closed valve. Pilot is high pressure at inlet that appears when compressor stops and unloader check valve closes.
  • Page 25 10/12/2010 AUTO BLOWDOWN (7/20) Pilot Line Company Confidential AUTO BLOWDOWN VALVE Company Confidential AUTO BLOWDOWN (7/26E – 7/51) Company Confidential...
  • Page 26 10/12/2010 AUTO BLOWDOWN (7/26E – 7/51) Pilot Line Company Confidential BLOWDOWN (7/71 – 12/56) Pilot Line Company Confidential MANUAL BLOWDOWN (7/71 – 12/56) Company Confidential...
  • Page 27 10/12/2010 INSTRUMENT PANEL (7/26E – 7/31E) Optional push after warm up button Instrument panel warning decal Pressure gauge Hourmeter Sequence key switch Company Confidential INSTRUMENT PANEL ( 7/51 – 7/71) A- Load button B- Dual pressure switch 0- “OFF” position 1- “RUN”...
  • Page 28 10/12/2010 INSTRUMENT PANEL (7/51) Tier 3 ALARMS & SHUTDOWNS Compressor 1 – High A/E Temp: Indicates shutdown due to high comp temp 1 High A/E temp 6 Comp Sensor 2 – High Separator Temp: Indicates shutdown due 2 High Separator temp 7 Low Engine Speed to high temp at separator tank discharge 3 –...
  • Page 29 10/12/2010 INSTRUMENT PANEL (7/51) Tier 3 ALARMS & SHUTDOWNS Engine More information can be found in the Yanmar Service Manual Use this manual in conjunction with our Electronic Manual to troubleshoot the entire system. Company Confidential OPERATION – STARTING Sequence Key Switch Position 0 Position 1 Position 2...
  • Page 30 10/12/2010 OPERATION – STARTING Turn key switch to position 3 (engine start position), release to position 1 when the engine starts. Company Confidential OPERATION – STARTING • At temperatures below 0ºC or if there is difficulty starting first time: 1. Open a service valve fully, with no hose connected 2.
  • Page 31 Never allow unit to stand idle with pressure in the system. Company Confidential ELECTRICS • Electrical relay operation • Wiring diagram 7/20 • Wiring diagram 7/26E – 7/31E • Wiring diagram 7/41 • Wiring diagram 7/51 • Wiring diagram 7/71 – 12/56...
  • Page 32 10/12/2010 WIRING DIAGRAM (7/20) Company Confidential WIRING DIAGRAM (7/26E – 7/31E) Company Confidential ELECTRICS (7/26E – 7/31E) The mini controller functions are: • CONTROL: – supplies the fuel solenoid pull-in and hold signals – supplies the starter solenoid signal • SAFETY: –...
  • Page 33 10/12/2010 ELECTRICS (7/26E – 7/31E) The mini controller functions are: • DIAGNOSTICS (optional) – LEDs that indicate the cause of a shutdown – alternator light – Tachometer • The air heater is driven by the key switch, not by the mini controller.
  • Page 34 10/12/2010 WIRING DIAGRAM (7/41) Company Confidential WIRING DIAGRAM (7/41) Company Confidential WIRING DIAGRAM (7/41) Company Confidential...
  • Page 35 10/12/2010 WIRING DIAGRAM (7/41) Company Confidential WIRING DIAGRAM (7/41) Company Confidential WIRING DIAGRAM (7/51 Tier 2) Company Confidential...
  • Page 36 10/12/2010 WIRING DIAGRAM (7/51 Tier 2) Company Confidential WIRING DIAGRAM (7/51 Tier 2) Company Confidential WIRING DIAGRAM (7/51 Tier 2) Company Confidential...
  • Page 37 10/12/2010 WIRING DIAGRAM (7/51 Tier 2) Company Confidential WIRING DIAGRAM (7/51 Tier 2) Company Confidential WIRING DIAGRAM (7/51 Tier 2) Company Confidential...
  • Page 38 10/12/2010 WIRING DIAGRAM (7/71 – 12/56 Tier 2) Machine “OFF” Company Confidential WIRING DIAGRAM (7/71 – 12/56 Tier 2 ) Machine “ON” Company Confidential WIRING DIAGRAM (7/71 – 12/56 Tier 2 ) IN BYPASS Company Confidential...
  • Page 39 10/12/2010 WIRING DIAGRAM (7/71 – 12/56 Tier 2 ) CRANK Company Confidential WIRING DIAGRAM (7/71 – 12/56 Tier 2) RUNNING Company Confidential TROUBLESHOOTING • OIL CARRYOVER • LOW AIR VOLUME • OVERHEATING • HIGH PRESSURE • STARTING PROBLEMS Company Confidential...
  • Page 40 10/12/2010 OIL CARRYOVER • Is the oil level correct, not overfilled? • Are the service valves closed before stopping the compressor? • Is the separator element in good condition? Company Confidential OIL CARRYOVER • Is the compressor being operated at the correct pressure? –...
  • Page 41 10/12/2010 LOW AIR VOLUME • Are the air cleaners clean? – Check the restriction indicators and service if required • Are there any leaks in the air pipe work? • Is the separator element clean? Company Confidential OVERHEATING • Is the oil level correct? •...
  • Page 42 10/12/2010 HIGH PRESSURE • Is the pressure regulator correctly operating? – Check the pressure setting – Check the diaphragm, leak at pin hole – Check the regulation pipe work • Is the unloader operating correctly? • Is the regulator orifice size correct? •...
  • Page 43 SL 40007 Wire Harness protection • 7/26E-7/31E SL 40012 Fuel Filter bracket relocation • 7/71  SL 40013 New Coupling JD unit • YANMAR  SL 40004 Yanmar Diagnostic Tool • 7/207/51  SL 40015 Heavy duty hose clamp Company Confidential...

This manual is also suitable for:

7/26e7/31e7/417/517/7112/56