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Stihl 140, Repair Manual, Page: 27 / 31

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Stihl 140 Repair Manual Download Page 27

- Remove shroud 

(see 5.1).

- Remove cover of switch housing

(see 9.2.1).

Note: Note circuit diagram; if
necessary, produce a drawing
clearly showing which wire
(note colour) is connected to the
respective terminals.

- Disconnect connecting lead from

microswitch.

- Press grommet out of housing

and pull out of housing together
with connecting lead (as for
power cable,

 see 9.2.3).

- Remove safety control block

(see 6.1).

•

Undo fastening screws on
microswitch.

- Replace defective parts.

Reassemble parts in reverse order.

Ensure that grommet is seated
correctly.

Important: O-rings must always
be replaced when carrying out
repairs. All moving parts and
sealing rings must be thinly coated
with special grease for high-
pressure cleaners 0781 145 3516
before assembling the parts.

9.2.5

Microswitch

621RA113 KN

10.

SPRAY ATTACHMENT

RE 140 K, 160 K

27

Summary of Contents for 140

Page 1: ...re pump 14 7 1 Screen in intake port water inlet 14 7 2 Removing installing delivery valves 14 7 3 Removing installing valve block and intake valves 14 7 4 Removing installing pump housing and pump piston 15 7 5 Disassembly assembly of pump piston 15 7 6 Replacing high pressure cups and oil seals 16 7 7 Replacing thrust bearings 17 8 Electric motor 18 8 1 Removal 18 8 2 Installation 21 9 Electrica...

Page 2: ...ed Microfilms are more up to date than printed spare parts lists Note the Technical Information bulletins They contain information on technical changes implemented after publication of this Repair Manual The Technical Information bulletins also supplement the spare parts list until a new edition is printed Repair Manuals and Technical Information bulletins should always be kept on hand wherever re...

Page 3: ... rate 500 l h 500 550 l h Suction lift 0 5 m 0 5 m Max water feed temperature Pressurized water supply 50 C 50 C In suction operation 40 C 40 C 3 3 Weights and dimensions Length approx 370 mm 370 mm Width approx 270 mm 270 mm Height approx 860 mm 860 mm Weight approx 20 0 kg 25 0 kg 3 4 Capacities High pressure pump 100 ml 100 ml Oil grade SAE 15 W 40 SAE 15 W 40 Depends on country concerned Austr...

Page 4: ...t head screw M6x35 15 1 pump housing Pump housing to Socket head screw M6x30 10 1 drive housing Drive housing to Socket head screw M5x25 7 1 2 stator housing Bearing cover and Hex bolt M6x25 7 1 3 drive housing to stator housing Screw plug Hexagonal socket head bolt R1 4 7 3 drive housing Remarks 1 Thread must be clean and dry 2 RE 140 K only 3 RE 160 K only 4 RE 140 K 160 K ...

Page 5: ... and replace if necessary High pressure cups worn Replace high pressure cups Pump does not run smoothly Water feed temperature is Reduce water feed temperature too high see technical specifications Intake line is damaged Replace intake line pump draws air Intake delivery valves of Clean or replace valves high pressure pump soiled or worn Safety control block cycles after Leak in high pressure syst...

Page 6: ...l sleeve not set to CHEM to CHEM High pressure hose coupling Tighten screw coupling is not screwed tight Detergent intake hose clogged Clean Injector clogged Clean Gasket on high pressure hose Replace or fit gasket connection defective or missing Weak ragged High pressure nozzle in Clean high pressure nozzle unclean jet spray head is soiled or worn with nozzle cleaning needle or replace if necessa...

Page 7: ...ding Check that supply voltage matches tripped because motor specified machine voltage overheating or overloaded Switch off machine and allow to cool for at least 3 minutes Spray head soiled Clean nozzle in spray head Note A correct power supply is essential if the machines are to operate faultlessly The voltage drop in the motor during operation must not be excessive otherwise the motor will turn...

Page 8: ... with the other hand at the same time Lift motor pump unit out of frame RE 160 K Undo fastening nuts on motor pump unit steadying the bolts at the same time if necessary Hold the machine steady and ensure that washers are not lost Lay machine in a horizontal position Lift motor pump unit out of frame Ensure that rubber buffers screws and washers are not lost All models Reassemble parts in reverse ...

Page 9: ...145 3516 Exceptions to this rule are mentioned where appropriate Note The permissible working pressure of the machine has been set on the safety control block by the manufacturer and must not be changed A lead seal is fitted to the safety control block for this reason The permissible working pressure must be reset after all repairs and a new lead seal fitted to the safety control block Remove shro...

Page 10: ...sing O rings 1 2 on control piston must always be replaced Examine control piston for signs of damage and replace completely if necessary Ensure that correct control piston is fitted spare parts list Draw valve body out of safety control block with hook 5910 890 2900 Remove ball and valve seat insert from safety control block Replace O ring 1 in valve body Examine valve body ball and valve seat in...

Page 11: ...er The cutout pressure pressure at which the bypass valve opens must be 5 bar higher than the maximum working pressure see 3 2 To check the setting Close spray gun and read off cutout pressure value on pressure gauge If the value is too high Open spray gun Back off adjusting nut slightly Close spray gun Check cutout pressure Repeat this procedure until the specified cutout pressure see above has b...

Page 12: ...ble parts in reverse order Thoroughly grease injector and O rings before refitting them special grease 0781 145 3516 Screw high pressure hose connection in as far as possible with new sealing ring Remove safety control block see 6 1 Remove injector see 6 4 Pull spring 1 and piston 2 out of safety control block housing use pliers if necessary Replace O ring 3 on piston Clean valve seat in safety co...

Page 13: ...e spring and ball of the non return valve are not lost in the process Remove O ring 1 from banjo bolt Pull banjo bolt out of metering valve Clean and examine all parts replace if necessary Clean valve seat in safety control block Reassemble parts in reverse order Fit valve ball in banjo bolt Fit valve spring with narrow end facing ball Align metering valve so that intake connector points back to i...

Page 14: ...e valves must also be checked see 7 2 if delivery valves are soiled or damaged Check correct functioning before installing valves Remove shroud see 5 1 and motor pump unit see 5 2 Remove safety control block see 6 1 Remove delivery valves if necessary see 7 2 Undo fastening screws 1 Remove retaining plate 2 with microswitch The intake valves are removed and installed in the same way as on the high...

Page 15: ...ock down crosswise 15 Nm Remove valve block 7 3 Drain oil see chapter 11 The pump housing and pump piston are removed and installed in the same way as on the high pressure cleaners of series RE 102 K 104 K and 106 K Note Steady the pump housing when undoing the fastening screws so that it is not pushed aside by the force of the springs Remove pump piston see 7 4 Remove spring and washer Remove cir...

Page 16: ...1 High pressure cup 2 Support ring 3 Valve block 4 Oil seal 5 Support ring 6 Pump housing 7 Guide bushing All models Note Use assembly device 4726 890 2200 assembly arbor and sleeve to fit the high pressure cups and oil seals Proceed as follows Coat inner surface of assembly sleeve 4726 890 2200 with special grease Fill the grooves of the high pressure cups and oil seals with special grease 0781 1...

Page 17: ...200 in the same way as the high pressure cups Do not damage the sealing lip Insert support rings in pump housing and press in with assembly arbor Reassemble remaining parts in reverse order Installation position of guide bushing see diagram Remove shroud see 5 1 and motor pump unit see 5 2 Remove safety control block see 6 1 valve block see 7 3 and pump housing see 7 4 The outer thrust bearing is ...

Page 18: ...RE 140 K Undo fastening screws in cover Remove cover and fan shroud Note The fastening screw is se cured with Loctite Block the fanwheel with a screw driver 1 but without damaging it Undo fastening screw 2 Examine fanwheel and replace if necessary Undo fastening screws on drive housing Carefully prise drive housing off stator housing with two screw drivers alternately working crosswise in small st...

Page 19: ...e arbor Important Oil seals shoulder bearings and ball bearings which have been removed must always be replaced by new parts RE 160 K Undo fastening screws for fan shroud Remove fan shroud Remove clamping ring 1 with standard extractor Remove fanwheel carefully pri sing it off with a screwdriver if ne cessary Examine fanwheel and replace if necessary Undo fastening screws in bearing cover Carefull...

Page 20: ...earing cover and replace if ne cessary Draw ball bearing off drive shaft in order to replace it Press rotor out of drive shaft with suitable arbor Examine ball bearing of drive housing and remove as described above if necessary Press oil seal down and out of drive housing with a screwdriver Unscrew valve Important Oil seals and ball bearings which have been removed must always be replaced by new p...

Page 21: ...s new shoulder bearing into drive housing until flush with housing using suitable tubing same outside diameter as outer bearing race Oil sealing lip of oil seal Insert rotor in drive housing Press inner race of shoulder bearing in drive housing onto drive shaft with suitable tubing inside diameter slightly larger than inner bearing race until it is flush with the shoulder Note The centre shaft of ...

Page 22: ...le tubing cut away in diagram Oil sealing lip of oil seal Press drive housing onto drive side ball bearing of rotor drive shaft with notch for feather key Insert rotor with drive housing in stator and align in original installation position compare markings Turn in fastening screws upper screw with fastening clamp for capacitor Note Tighten fastening screws alternately to avoid stressing the housi...

Page 23: ...cable must be unplugged from the socket outlet at all times while carrying out repairs B4 Microswitch C1 Capacitor M1 Motor with overload protection Q1 Master switch W1 Connecting lead 9 ELECTRICAL SYSTEM M1 M 1 W1 Q1 L1 N PE C1 P B4 621RA077 BL 9 1 Circuit diagram RE 140 K 160 K 23 ...

Page 24: ... replace if necessary Reassemble parts in reverse order RE 160 K Undo fastening screws in cover of switch housing Ensure that nuts are not lost Remove cable lugs from switch Remove switch see 9 2 2 Remove cover Examine gasket 1 of switch housing and replace if necessary Undo fastening screws of switch housing Lift switch housing up taking care not to damage the wires Examine gasket 1 and replace i...

Page 25: ...lation position of switch the two lugs 1 on the switch fit between the bumps 2 in the cover Grease O ring before refitting rotary knob Remove shroud see 5 1 Remove cover of switch housing see 9 2 1 Note Note circuit diagram if necessary produce a drawing clearly showing which wire note colour is connected to the respective terminals RE 140 K Remove lugs of power cable from switch Prise cable gromm...

Page 26: ... showing which wire note colour is connected to the respective terminals Disconnect capacitor connecting leads RE 140 K Press capacitor out Check O ring on capacitor and replace if necessary Replace defective parts RE 160 K Press cable grommet out of housing and pull out of housing with connecting lead as for power cable see 9 2 3 Release fastening clamp 1 and pull capacitor out sideways Remove fa...

Page 27: ...er with connecting lead as for power cable see 9 2 3 Remove safety control block see 6 1 Undo fastening screws on microswitch Replace defective parts Reassemble parts in reverse order Ensure that grommet is seated correctly Important O rings must always be replaced when carrying out repairs All moving parts and sealing rings must be thinly coated with special grease for high pressure cleaners 0781...

Page 28: ...rextended This is the case if it protrudes strongly from the groove Replace O ring 2 The remaining procedure for disassembling and assembling the spray gun is the same as on high pressure cleaners of series RE 101 K Additional steps Remove connecting elements 1 from spray lance 2 Replace O rings 3 Undo locking screw 1 on spray head Unscrew spray head from spray lance noting the nozzle and spring R...

Page 29: ... in retainer for leaf springs Leaf springs should only be removed if damaged Proceed as follows Disengage leaf spring catch 1 Remove leaf spring with pliers Leaf springs which have been removed must always be replaced by new ones Examine all parts for damage and replace if necessary Ensure the correct nozzle is used see spare parts list Reassemble parts in reverse order Note installation position ...

Page 30: ... hexagon socket wrench All models Turn motor pump unit on its side and let oil drain completely into a sufficiently large container RE 160 K Note The pressure compensa ting valve should only be removed if leaking or damaged Proceed as follows Carefully prise relief valve off with a screwdriver Do not damage housing Examine relief valve and replace if necessary Replace O ring 1 Grease relief valve ...

Page 31: ...tor 4703 890 4500 Drawing ball bearings off drive shaft 5 1 4 hexagon socket wrench Screw plug in drive housing 6 Torque wrench 5910 890 0300 7 Torque wrench 5910 890 0310 8 Test pressure gauge 5910 850 3205 Setting pressure control system 12 2 Service accessories No Part name Part No Use 1 Special grease waterproof 0781 145 3516 O rings high pressure cups 50 g tube sliding surfaces in contact wit...

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