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SM_MH 3M_4M Ver.1.2_May 2016 

Adjustment / Test 

 87 

G 

MH 4M Unloader 

Unloader - Retaining pressure adjustment. 

Install the test manometer, 1206358, between the machine outlet and the high pressure hose. 

Run machine with full pressure and water volume (water regulator closed). 

Close the spray handle, let the motor stop and read the retaining pressure on the test manometer 

The retaining pressure is adjusted by tightning or loosening the unloader spring.  

 

Correct retaining pressure is to be founds in the Technical data sheets in chapter B. 

Test manometer, 1206358 

Counter nut 

Adjusting nut 

Unloader spring 

Содержание 107146895

Страница 1: ...MH 3M MH 4M SERVICE MANUAL SM_MH 3M_4M Ver 1 2_May 2016...

Страница 2: ...rated spare parts lists during repairs They show the assembly position and the sequence in which the individual components should be assembled See Technical Service Bulletin TSB sheets They include in...

Страница 3: ...A B C D E F G H I Special tools Wiring diagrams Adjustment Test Service Repair Troubleshooting Function Construction Technical data Safety instructions 4 5 24 25 40 41 56 57 59 60 81 82 90 91 98 99...

Страница 4: ...e Only allow the high pressure Repair work should be carried out by persons instructed in electrical installations or by trained electricians only Take the following ESD precautions before carrying ou...

Страница 5: ...Technical data SM_MH 3M_4M Ver 1 2_May 2016 5 B...

Страница 6: ...Technical data SM_MH 3M_4M Ver 1 2_May 2016 6 B...

Страница 7: ...Technical data SM_MH 3M_4M Ver 1 2_May 2016 7 B...

Страница 8: ...Technical data SM_MH 3M_4M Ver 1 2_May 2016 8 B...

Страница 9: ...Technical data SM_MH 3M_4M Ver 1 2_May 2016 9 B...

Страница 10: ...Technical data SM_MH 3M_4M Ver 1 2_May 2016 10 B...

Страница 11: ...Technical data SM_MH 3M_4M Ver 1 2_May 2016 11 B...

Страница 12: ...Technical data SM_MH 3M_4M Ver 1 2_May 2016 12 B...

Страница 13: ...Technical data SM_MH 3M_4M Ver 1 2_May 2016 13 B...

Страница 14: ...Technical data SM_MH 3M_4M Ver 1 2_May 2016 14 B...

Страница 15: ...Technical data SM_MH 3M_4M Ver 1 2_May 2016 15 B...

Страница 16: ...Technical data SM_MH 3M_4M Ver 1 2_May 2016 16 B...

Страница 17: ...Technical data SM_MH 3M_4M Ver 1 2_May 2016 17 B...

Страница 18: ...Technical data SM_MH 3M_4M Ver 1 2_May 2016 18 B...

Страница 19: ...Technical data SM_MH 3M_4M Ver 1 2_May 2016 19 B...

Страница 20: ...Technical data SM_MH 3M_4M Ver 1 2_May 2016 20 B...

Страница 21: ...Technical data SM_MH 3M_4M Ver 1 2_May 2016 21 B...

Страница 22: ...Technical data SM_MH 3M_4M Ver 1 2_May 2016 22 B...

Страница 23: ...Technical data SM_MH 3M_4M Ver 1 2_May 2016 23 B...

Страница 24: ...Technical data SM_MH 3M_4M Ver 1 2_May 2016 24 B...

Страница 25: ...0 PA EU 230 1 50 13 MH 3M 160 770 PA EU 400 3 50 8 Lance holder Hook f HP hose Lock f service door Fuel tank cap Service door Operating panel Water outlet Holders f Spray handle Detergent container Wa...

Страница 26: ...ensor Ignition electrodes Fan housing Outlet HP hose Chimney Flow switch Safety valve Lid for Water Break Tank Lid for adding Anti freeze AntiStone valve AntiStone adjustment Lock f service door Fuel...

Страница 27: ...mney Double Flow switch Double non return valve Lid for Water Break Tank Lid for adding Anti freeze AntiStone valve AntiStone adjustment Lock f service door Oil container High Pressure Outlet Pipe Byp...

Страница 28: ...housing Outlet HP hose Chimney Flow switch Safety Valve Lid for Water Break Tank Lid for adding Anti freeze AntiStone valve AntiStone adjustment Lock f service door Oil container High Pressure Outlet...

Страница 29: ...Operating panel MH 3M Thermostat Detergent dosing valve ECO mode EcoMode for low con sump on hea ng stage at 60 C ON OFF switch Cold water mode Hot water mode Power ON AntiStone low Service interval d...

Страница 30: ...panel MH 4M Thermostat De ECO mode EcoMode for low con sump on hea ng stage at 60 C ON OFF switch Cold water mode Hot water mode Power ON AntiStone low Service interval due expired Boiler overheated N...

Страница 31: ...nt dosing valve Board with LED s Thermostat ON OFF switch AntiStone tank The control transformer is placed below the NEO main circuit board Push on the 3 plastic clips on the side of the of the circui...

Страница 32: ...ottom and top in a sandwich construction between which the combustion air is routed into the combustion An insulating material placed in the bottom of the boiler makes sure that the inner bottom among...

Страница 33: ...lips must be opened 2 of the clips are shown on the picture above Now the lid can be removed from the water break tank If needed in very dirty invironments the 50 m micron water inlet filter can be in...

Страница 34: ...Construction SM_MH 3M_4M Ver 1 2_May 2016 34 C MH 3 MH 4 Chassis...

Страница 35: ...Construction SM_MH 3M_4M Ver 1 2_May 2016 35 C MH 3 MH 4 Cabinet...

Страница 36: ...Construction SM_MH 3M_4M Ver 1 2_May 2016 36 C MH 3 MH 4 Hose reel...

Страница 37: ...Construction SM_MH 3M_4M Ver 1 2_May 2016 37 C MH 3M PA Pump components Motor components...

Страница 38: ...Construction SM_MH 3M_4M Ver 1 2_May 2016 38 C MH 4M PA Motor pump components Motor pump components Unloader components...

Страница 39: ...Construction SM_MH 3M_4M Ver 1 2_May 2016 39 C MH 4M FA Motor pump components Motor pump components By pass valve components...

Страница 40: ..._MH 3M_4M Ver 1 2_May 2016 40 C MH 3M MH 4M Flow switch Flow switch MH 3M 4M PA 3 Flow piston 4 Reed switch 8 Safety valve Flow switch MH 4M FA 3 Flow piston 4 Reed switch 5 10 Double non return valve...

Страница 41: ...witch to by pass mode for 20 sec before it stops PA pressure activated models gets a stop signal from the micro switch Once machine has started up the status indicator lights up the green light on the...

Страница 42: ...ill be added into the water break tank and the low level indi cator will be ignored Once the adjustment is set between and 4 the dosage will be according the user manual Low level indicator is active...

Страница 43: ...ch to by pass mode for 20 sec before it stops FA flow activated models gets a stop signal from the flow switch Once machine has started up the status indicator lights up the green light on the plug ic...

Страница 44: ...nto the water break tank and the low level indi cator will be ignored Once the adjustment is set between and 4 the dosage will be according the user manual Low level indicator is active in this settin...

Страница 45: ...outer to the air distributor This pre heats the air before it mixes with the fuel spray from the fuel nozzle Cold water is fed to the inner circuit in where the boiler temperature is highest This redu...

Страница 46: ...mode constant ignition and generates ignition sparks across the electrodes to ignite the fuel spray This process is monitored by the flame sensor on top of the boiler In normal operation the flame and...

Страница 47: ...the oil level gets below min the machine stops and a light comes ON in the display B7 Flame sensor detects light from the flame If the flame is not detected when it should be there the machine will s...

Страница 48: ...tch Motor starts Easy start valve is open until pressure starts to build up in the pump the pressure is building up until it reach the cut off pressure When the cut off pressure is reached the control...

Страница 49: ...ted on the main switch Motor starts the pressure is building up until it reach the cut off pressure When the cut off pressure is reached the control piston is pushed upwards by the higher pressure the...

Страница 50: ...istons than under the lower piston the by pass valve is closed and the machine runs in working mode When the spray gun is closing the flow shortly stops and the pressure rises The opening pressure val...

Страница 51: ...lance and high pressure nozzle the spray handle 8 is now activated The non return valve 7 opens the pressure in the hose drops and release the pressure on the backside of the unloader piston 5 The un...

Страница 52: ...5 is pressed forward caused by the outlet pressure exceeding the pressure from the unloader spring the By pass ball 6 is moved forward and opens the connection between the water inlet and the water ou...

Страница 53: ...spray handle and open water regulator 1 Valve for water regulation is open Approx 50 of water volume is run ning in by pass back to suction side in pump 2 Water can pass through the non return valve...

Страница 54: ...ure position open spray handle and open water regulator 1 Valve for water regulation is open Approx 50 of water volume is run ning in by pass back to suction side in pump 2 Water can pass through the...

Страница 55: ...handle with open water regulator 1 Valve for water regulation is open 2 Non return valve is closing for opening to the water regulation valve for building up the pressure with open water regulator Th...

Страница 56: ...lve is to make sure the unloader stem move slower after opening the spray handle If the stem moves too fast the ball at the end of the stem will close against its seat too fast and the pressure behind...

Страница 57: ...Troubleshooting SM_MH 3M_4M Ver 1 2_May 2016 57 E MH 3M MH 4M...

Страница 58: ...Troubleshooting SM_MH 3M_4M Ver 1 2_May 2016 58 E MH 3M MH 4M...

Страница 59: ...d for trouble shooting For more information please read TSB PPW 2016 006 Nilfisk Service Tool Instructions MH 3M_4M Nilfisk Service Tool must be used for re setting the service light and changing the...

Страница 60: ...ice door by turning the two quarter turns Pump seen through service opening Remove the U pin to dismount the water inlet con nection Remove screw for micro switch bracket Remove the U pin to dismount...

Страница 61: ...ervice Repair 61 F MH 3M Pump Dismount the 3 cylinder head bolts Pull off the cylinder head Dismount the 4 bolts holding the cylinder block Dismount the cylinder block Dismount the bearing disc and be...

Страница 62: ...block Use e g a Bahco Puller type 4521 N F Bahco puller not shown for puller is type 4524 G Oil seals must be installed by using punch 1210996 Check that the O ring in the midle of the cylinder block...

Страница 63: ...alve seat stays in the cylinder head it can be pulled out with a Bahco puller Pressure and Suction valves disassembling Pull out the water seals and trust collars Use e g a Bahco Puller type 4521 N F...

Страница 64: ...mble the outlet coupling and fitting Non return valve housing Spring and non return piston can be pulled up with a pair of pliers Non return components Regulator Safety Block disassembling Loosen and...

Страница 65: ...Loosen unbloader valve Pull out the unloader valve Unloader disassembling 1 Counter nut 2 Adjustment screw 3 Housing 4 Lock pin 5 Lock ring for lock pin 6 Washer f spring 7 Spring 8 Valve cone housing...

Страница 66: ...SM_MH 3M_4M Ver 1 2_May 2016 Service Repair 66 F MH 3M PumpTorque Settings...

Страница 67: ...er and water inlet connections Use a small screwdriver for pulling out the pin for the water inlet connection Pull out the water inelt connection from the water inelt manifold Remove the 3 screws for...

Страница 68: ...r head Remove the 3 secondary water seals if left on the pistons Remove the 2 screws one in each side for the Remove the Cylinder block Remove the screw which holds the wobble disc Use a screwdriver o...

Страница 69: ...ble disc using a 16 mm bolt Remember to remove the braing track sitting in the Remove the 3 secondary water seals Remove the 3 thrust collars with an expandable puller Remove the 3 primary seasl with...

Страница 70: ...e pressure vavles Remove the 3 pressure valves Remove the 3 pressure valves Pull up the 3 pressure valve seats Use a 5mm screw there are thrads inside the pressure valve Remove the 3 distance rings fo...

Страница 71: ...nd make sure the components are assemb led as shown on the next 2 pictures Pull out the oil seals from the cylinder block using an expandable puller The curved edge A of the bearing tracks must be mou...

Страница 72: ...SM_MH 3M_4M Ver 1 2_May 2016 Service Repair 72 F MH 4M pump 55 Nm 20 Nm 10 Nm 40 Nm Torque specificcations Bolt for wobble disc 20 Nm...

Страница 73: ...Repair 73 F MH 4M pump 3 6 Automatic venting valve 7 Injector nozzle for control piston 9 Return valve for by pass water 12 By pass valve housing 17 Handle for water regulation 19 Plug for by pass val...

Страница 74: ...Hose reel Caryfully install the back up ring pos 9 for the O ring pos 10 by rolling it onto the swivel Do NOT open the back up ringas shown above Lubricate the svivel with silicone grease Push in the...

Страница 75: ...foot when removing boiler or rear wheels Support foot Support foot must be placed below the two fork lift symbols When the support foot is positioned plase your foot on the support foot as show above...

Страница 76: ...the sensor Dismount the 2 screws for the flame sensor and the flame sensor holder to dismount the protection plate Dismount the fuel hose Push the red quick connecti on and pull out the fuel hose Pull...

Страница 77: ...s are dismounted the heatiing coil including the inner boiler top can be lifted up It is recommended to replace the insulation when servicing the boiler Clean boiler inside for deposits Burner unit Bu...

Страница 78: ...soot has build up on the heating coil pipes the heating coil must be dismounted and cleaned 2 All fuel filters fuel tank inlet filter fuel line filter fuel nozzle filter and fuel pump filter must be c...

Страница 79: ...Repair 79 F Heating system Check and clean fuel filter in fuel tank inlet Replace fuel filter on fuel line Dismount the plug below the fuel outlet port Pull off the fuel filter from the plug and repl...

Страница 80: ...ows and then pull bumper against you Remove screw for support pipe Remove the right wheel fuel tank lid pump outlet pipe and the side cabinet part Remove the 3 screws holding the side cabinet part To...

Страница 81: ...the fuel tank is as far out as shown above the fuel hoses 2 and the fuel level sensor if installed must be dismounted before re moving the tank completely When installing the tap in fuel tank there i...

Страница 82: ...or Ker osene A fuel pressure check will be a part of such an adjustment A check of air damper setting and oil pressure are also recommended when fuel nozzle fuel pump fan wheel or other fuel related c...

Страница 83: ...ture 1 Mount the fuel pressure manometer on the fuel pump or on the pipeline between fuel pump and fuel nozzle 2 Start up the machine on max pressure and flow Switch on the heat boiler and turn to max...

Страница 84: ...he centre of the chimney 7 Set the air damper until specified CO2 is obtained Be aware that it can take several minutes before stabiliz ing Setting air clockwise More air decreasing CO2 Counter clock...

Страница 85: ...12 Turn off the heat switch and let the machine run for 1 min on cold mode and stop the machine 13 Demount the fuel pressure manometer and assemble the fuel pump and tube 14 If a hot water machine is...

Страница 86: ...est gauge 5 The correct retaining pressure is shown in the data sheets in section B in this manual NOTE Retaining pressure is the pressure the pump reaches when the motor stops 1 The retaining pressur...

Страница 87: ...n machine with full pressure and water volume water regulator closed Close the spray handle let the motor stop and read the retaining pressure on the test manometer The retaining pressure is adjusted...

Страница 88: ...ll water volume water regulator closed with correct high pressure nozzle and read the output pressure on the test manometer Dismount the high pressure hose from the test manometer and start machine wi...

Страница 89: ...tor and machine without pressure do the following to adjust the water regulator Turn gently the small brass shaft 1 counterclockwise until it JUST touches the surface of the plug 2 Push down the blue...

Страница 90: ...SM_MH 3M_4M Ver 1 2_May 2016 Adjustment Test 90 G MH 3M 4M AntiStone valve Adjustment knob for AntiStone valve Adjustment knob for settings...

Страница 91: ...Wiring diagrams SM_MH 3M_4M Ver 1 2_May 2016 91 H...

Страница 92: ...Wiring diagrams SM_MH 3M_4M Ver 1 2_May 2016 92 H...

Страница 93: ...Wiring diagrams SM_MH 3M_4M Ver 1 2_May 2016 93 H...

Страница 94: ...Wiring diagrams SM_MH 3M_4M Ver 1 2_May 2016 94 H...

Страница 95: ...Wiring diagrams SM_MH 3M_4M Ver 1 2_May 2016 95 H...

Страница 96: ...Wiring diagrams SM_MH 3M_4M Ver 1 2_May 2016 96 H...

Страница 97: ...Wiring diagrams SM_MH 3M_4M Ver 1 2_May 2016 97 H...

Страница 98: ...ow fuse This is meant as a guideline for finding the component that is the root cause to a blown fuse Fuses Check the components in the order they are listed below Fuses Fuse Components to check for r...

Страница 99: ...oot from boiler N A Testo 327 or similar com bustion gas analyzer Measurering CO2 value N A 16 mm Bolt Dismounting wobble disc NA5 2 pump 17246 Fuel pressure gauge Measurering fuel pressure 101221030...

Страница 100: ...Notes 100 SM_MH 3M_4M Ver 1 2_May 2016...

Страница 101: ...Nilfisk A S Industrivej 1 9650 Hadsund Denmark www nilfisk com...

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