Husqvarna 545, 545 TrioBrake, 550XP 550XP TrioBrake, 550XPG, and 550XPG TrioBrake chainsaw Clutch and Sprocket Repair guide will help with any Clutch and Sprocket replacement, inspection and correct running of the chainsaw.

A Service Manual detailing the Clutch and Sprocket Repair procedures with full diagrams, as well as more complete chainsaw repair information, is available to download. A Husqvarna 545, 545 TrioBrake, 550XP, 550XP TrioBrake, 550XPG, and 550XPG TrioBrake Parts List, Operator Manual, and carburetor manual are also available to view or download as a PDF which can be read on any device or easily printed.

Dismantling the centrifugal clutch

Fig 1

1

Remove the cylinder cover. Release the brake by moving the kickback guard backwards. Loosen the bar nuts and remove the clutch cover, chain and bar. See figure 1.

2

Fig 2

Loosen the spark plug hat and remove the spark plug, and insert the plastic piston stop (575 29 36-01). See figure 2.

3

Loosen the clutch using tool 575 25 14-01nd a suit- able socket wrench or combination spanner. Turn the clutch clockwise to loosen it. See figure 2.

4

Min. 65 mm

Fig 3

Secure the clutch in a vice as shown in figure 3. Carefully remove the clutch springs. Remove the clutch shoe springs from the side that does not have text.

NOTE!

Be careful with the clutch springs, as opening them too much can result in material damage.

Cleaning and inspection

• Clean and check all parts carefully. Parts must be replaced if cracked or showing signs of other defects. Always use original spare parts.
• Check the thickness of the clutch shoes by meas- uring them with slide callipers across the whole clutch hub. If the thickness is below 65 mm, the clutch must be replaced. See figure 16.
  1. Assembly of centrifugal clutch

Fig 1

1

Insert the clutch springs on the side of the shoes without text. See figure 1.

2

Screw in the clutch (anti-clockwise) until it stops. Then tighten the clutch using tool 575 25 14-01 and a suitable socket wrench or combination span- ner. Tightening torque of at least 25 Nm.

3

Remove the piston stop and fit the spark plug using a tightening torque of 20 Nm and the spark plug hat.

Then fit:

• • The cylinder cover
  • The bar

Fig 18

• • The chain
  • The clutch cover

Dismantling the oil pump and screen

1

Empty and clean the oil tank.

Dismantle the centrifugal clutch as outlined in “Dismantling the centrifugal clutch”.

2

Fig 19

Loosen the clutch drum, the drive sprocket, the needle bearing and the pump drive wheel. See figure 18.

3

Unscrew the chain guide plate. See figure 19.

4

Loosen the screws on the oil pump from the crank- case and remove it together with the oil pressure hose. See figure 20.

Cleaning and inspection

• • Clean and check all parts carefully. Parts must be replaced if cracked or showing signs of other defects.
  • Lubricate all moving parts with chain oil.

This guide covers the following chainsaws:Husqvarna 545, 545 TrioBrake, 550XP, 550XP TrioBrake, 550XPG, and 550XPG TrioBrake  for Clutch and Drive Sprocket Repair