Stihl MS 251 Support Question
Stihl MS 251 Support Question
Find answers below for this question about Stihl MS 251.Need a Stihl MS 251 manual? We have 1 online manual for this item!
Question posted by egadomski on April 3rd, 2016
How To Replace Hand Guard
I Broke The Hand Guard On The Clutch Brake . I Have Ordered The Part And Want To Be Sure How To Replace It. Part Number Is 1143 792 9103, For A Sthil Ms251. Thank You
Current Answers
Answer #1: Posted by aureliamarygrace on April 3rd, 2016 6:37 AM
aureliamarygrace
Member since:
December 31st, 2012 Points: 1,682,568
Member since:
December 31st, 2012 Points: 1,682,568
Please watch these youtube video tutorial
Or you may refer to instruction manual at Page 35
Related Stihl MS 251 Manual Pages
Instruction Manual - Page 2
....5 Carburetor
88
12.5.1 Leakage Test
89
RA_737_00_01_01
MS 231, MS 231 C, MS 251, MS 251 C
q
© ANDREAS STIHL AG & Co.
Specifications
5
2.1 Engine
5
2.2 Fuel System
5
2.3 Ignition System
5
2.4 Chain Lubrication
5
2.5 Tightening Torques 6
3. Troubleshooting
8
3.1 Clutch
8
3.2 Chain Drive,
Chain Brake,
Chain Tensioner
9
3.3 Chain Lubrication
11
3.4 Rewind Starter...
Instruction Manual - Page 4
...numbers of the individual components and assemblies.
They must not project since publication of this service manual.
Refer to the latest edition of the relevant parts list to third parties.
Service manuals and all assemblies. MS 231, MS 231 C, MS 251, MS 251...and washers. They show the installed positions of any replacement parts. The manual lists all the repair and ...
Instruction Manual - Page 5
... dry or with the connector, preferably by the STIHL part number, the { logo and the STIHL parts symbol K This ...and repair work on the fuel system and the engine. replace as the safety precautions and warnings in certain conditions. ...identified by hand, to ensure the tightness of repairs or maintenance work with fuel must be tightened to overheating.
4
MS 231, MS 231 C, MS 251, MS 251 C ...
Instruction Manual - Page 7
...chain brake / engine housing
4.0
M 5
Filter base / baffle / carburetor
3.5
P 6x26.5 Handlebar / tank housing, right
6.0
M 5x16
Handlebar / tank housing, bottom
5.0
M 5x20
Hand guard / ...Retainer
1.0
Q B
2), 3) 2)
1), 3) 1), 3)
1), 3) 2), 3) 4)
6
MS 231, MS 231 C, MS 251, MS 251 C Fastener
Thread size For component
Torque Nm
Remarks
Screw Screw Screw Screw Screw Collar screw Collar...
Instruction Manual - Page 9
... stretched
Clutch springs broken
Readjust idle speed screw LA
Replace the clutch springs or install new clutch
Replace the clutch springs
Loud noises
Clutch springs stretched Needle cage damaged Clutch shoe retainer broken Clutch shoes and carrier worn
Replace all clutch springs Fit new needle cage Install new retainer or clutch Install new clutch
8
MS 231, MS 231 C, MS 251, MS 251 C
Instruction Manual - Page 10
... high Clutch springs stretched
Clutch springs broken
Readjust idle speed screw LA
Replace the clutch springs or install new clutch
Replace the clutch springs
Saw chain does not stop immediately when brake is activated
Brake spring stretched or broken Fit new brake spring
Brake band stretched or worn Clutch drum worn
Fit new brake band Install new clutch drum
MS 231, MS 231 C, MS 251, MS 251...
Instruction Manual - Page 11
...
QuickStop Super Coasting brake does not disengage properly even though lockout lever is depressed
Too much free travel on lockout lever
QuickStop Super Braking action of coasting brake inadequate - lockout lever not depressed
Brake cable overtensioned
Remedy Readjust brake cable
Reconnect or replace brake cable Adjust brake cable
Adjust brake cable
10
MS 231, MS 231 C, MS 251, MS 251 C
Instruction Manual - Page 12
...intake hose and pickup
or intake hose ruptured
body
Valve in oil tank blocked
Clean or replace valve
Teeth on worm worn
Install new worm
Oil pump damaged or worn
Install new ...
Oil pump damaged or worn Worm driver is loose
Install new oil pump Install new worm
MS 231, MS 231 C, MS 251, MS 251 C
11 rectify other sources of trouble with the
chain lubrication system, check and
.
3.3...
Instruction Manual - Page 13
...Rewind spring very dirty or corroded Insufficient spring tension
Rewind spring broken
Clean or replace rewind spring
Check rewind spring and increase tension Fit new rewind spring
Starter ...or replace pawls and torsion springs if necessary
Lugs on pawl or pawl itself is difficult to carrier
Spring in spring housing fatigued Install new spring housing
12
MS 231, MS 231 C, MS 251, MS 251 C...
Instruction Manual - Page 15
...
Check operation of adjustment - 3.5 Ignition System
Condition
Engine runs roughly, misfires, temporary loss of the spark plug, clean or replace spark plug if necessary.
14
MS 231, MS 231 C, MS 251, MS 251 C Check ignition lead/module, replace ignition module if necessary. Check operation of power
Cause
Remedy
Spark plug boot is loose
Press boot firmly onto spark...
Instruction Manual - Page 16
...foreign matter in accelerator Install new carburetor pump worn or damaged
MS 231, MS 231 C, MS 251, MS 251 C
15 Helical spring not located on nipple Remove the inlet...leaking
Fit new diaphragm gasket
Metering diaphragm damaged or shrunk
Fit a new metering diaphragm
Tank vent faulty
Replace tank vent
Leak on fuel hose from tank to carburetor
Seal connections or install new fuel hose
Engine...
Instruction Manual - Page 23
... holes.
2310RA023 TG
22
MS 231, MS 231 C, MS 251, MS 251 C Lubricate the pivot pins, b 14
1
2
1
: Slip the spacer washer (1) onto the pin (2).
1
2
2310RA022 TG
1 3
: Remove the spacer washer (1) and strap (2).
: Pull out the flat spring (3).
2310RA018 TG
2310RA020 TG
TOP
: Push the loop of the hand guard (1).
- Check the cam on the hand guard and replace the hand guard if necessary...
Instruction Manual - Page 24
...relaxed condition. Reassemble all other parts in the brake spring's anchor pin is not the case, replace the brake spring.
- If the groove in the reverse...bearing boss of the hand guard (1) and the brake lever (2) a little and position them over the machine until the cam of the brake spring must be tightly against one another in hand guard, b 14
- MS 231, MS 231 C, MS 251, MS 251 C
23 If ...
Instruction Manual - Page 25
...hand guard and brake lever.
2310RA033 TG
1
: Take the brake lever (2) out of the flat spring (1) into its seat (arrow) as far as stop.
2310RA020 TG
24
MS 231, MS 231 C, MS 251, MS 251 C Remove the brake spring from the brake...2
- The brake spring is worn, install a new engine housing.
- 2310RA035 TG
5.4 Brake Lever on the hand
guard and replace the hand
1
guard if necessary. ...
Instruction Manual - Page 26
MS 231, MS 231 C, MS 251, MS 251 C
25
TOP
1
1
2310RA039 TG
2310RA021 TG
3
2
: Fit the strap (1) on to one side until the cam of the hand guard (arrow) slips passed it.
- : Push the brake lever (2) into its seat (arrow) as far as stop.
Push the hand guard bearing boss and the brake lever on the pivot pins (2) and (3) so that the brake... Push the hand guard (1) with brake lever (2) ...
Instruction Manual - Page 27
... groove in order, the reason may be relaxed when the lockout lever is visible.
: Attach the spring (1) to the anchor pin (2).
: Use the assembly tool 1117 890 0900 to disconnect the brake spring (1) from the anchor pin (arrow).
- Adjust the brake cable, b 5.4.1
- The brake band (1) must locate snugly against one another in hand guard, b 14
- Release...
Instruction Manual - Page 59
...
- Lift the hand guard a little and remove the fan housing.
1
2310RA201 TG
1
: Engage the segment (1) in the slots (arrows) in position.
: Insert screw (1) with dirt or pitch, the entire starter mechanism, including the rewind spring, must be assumed that the starter mechanism is in the reverse sequence.
58
MS 231, MS 231 C, MS 251, MS 251 C
This has...
Instruction Manual - Page 64
... firmly in the rope guide bushing (arrow) without drooping to one side. Lubricate the replacement spring with frame with a few drops of the rope.
- the frame slips off one...-
If this process. Place a blanket over the work gloves to protect your eyes and hands from injury.
: Hold the starter grip (1) firmly to the recesses (arrows) and push... - MS 231, MS 231 C, MS 251, MS 251 C
63
Instruction Manual - Page 95
... C, MS 251, MS 251 C the high speed screw (H) may
otherwise be damaged.
1
1
2310RA278 TG
: Screw down the high speed screw H (1) as far as
the detent (arrow) - Take out the high speed screw (H). The basic setting is performed through the pre-installed limiter cap with screwdriver 5910 890 2306.
- do not push fully home.
left-hand...
Instruction Manual - Page 101
...hand
until the pressure gauge indicates a pressure of 0.5 bar. Operate the pump until it engages the peg (arrow).
1
2310RA370 TG
12.10.2 Removing and Installing - If the pressure drops, the leak must be located and the faulty part replaced...constant for leverage. Always install a new tank vent.
100
MS 231, MS 231 C, MS 251, MS 251 C pressurize the fuel tank.
: Press the tank housing...
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