Husqvarna 545 Mark II Workshop Manual page 46

8.14.5 To disassemble the carburetor
To get access to the carburetor, refer to
the carburetor on page 41 .
1. Remove the four screws and washers (A) from the
metering cover (B).
2. Remove the gasket (C), metering diaphragm (D),
spiral (E) and gasket (F).
3. Remove the screw (G), the inlet needle (J), the
metering lever (H), the pin (I) and the spring (K).
4. Remove the two screws (L).
5. Remove the throttle body assembly (M).
6. Remove the screw (N) and pump cover (O).
7. Remove the gasket (P), the boost diaphragm (Q)
and the pump diaphragm (R).
8. Remove the fuel screen (S).
8.14.6 To clean and examine the carburetor
1. Clean all parts in clean gasoline. Use compressed
air to dry the gasoline. Point the air through all
channels in the carburetor housing and make sure
that the channels are not blocked.
2. Make sure that there is no play on the throttle valve
and the shafts of the choke valve.
3. Examine all parts for damage and wear. Replace the
parts that show sign of damage.
4. Use the Engine Diagnostic Tool to examine the
™
AutoTune unit. Refer to
®
Mark II, 550 XP Mark II, 545G Mark II and 550
®
XP G Mark II on page 12 .
8.14.7 To assemble the carburetor
CAUTION: Assemble the carburetor in a clean
environment. Contamination can cause damage
to the product.
Note: When you replace the carburetor, a firmware
download is necessary on the new carburetor. With the
firmware installed, the carburetor must be approved on
the test "autotest" in the CST before use. Refer to the
CST for instructions.
1. Lubricate the shaft bearings with a light oil.
2. Attach the fuel screen (S). Use the handle of a small
screwdriver.
3. Assemble the pump diaphragm (R), the boost
diaphragm (Q), the gasket (P) and the pump cover
(O) to the carburetor with the screw (N).
4. Attach the two screws (L) to the throttle body
assembly (M).
46 - Repair instructions
To get access to
Servicing tools for 545
5. Assemble the inlet needle (J) and the metering lever
(H), the pin (I) and the spring (K). Tighten the screw
(G).
6. Measure the distance between the metering lever
(H) and the gasket surface of the carburetor
Servicing tools on page 12 . The
housing. Refer to
distance must be 0.55 mm. If it is more or less than
0.55 mm, you must adjust the distance. Refer to
adjust the metering lever on page 47 .
7. Assemble the gasket (C), the metering diaphragm
(D), the spiral (E), and the gasket (F) on the
carburetor housing. Make sure that you assemble
the parts in the correct sequence.
8. Attach the metering cover (B) to the carburetor
housing.
9. Do a pressure test of the carburetor. Refer to
a pressure test of the carburetor - option 1 on page
47 or To do a pressure test of the carburetor -
option 2 on page 47 .
10. On 545 Mark II and 550 XP
screws and washers (A) and tighten the screws.
11. On 545G Mark II and 550 XP
the heating element on the carburetor. Attach the
four screws and washers (A) and tighten the screws.
To
To do
®
Mark II: Attach the four
®
G Mark II: Assemble
722 - 003 - 26.03.2019