8.18.9 To do a pressure test of the product
1. Remove the cylinder cover.
2. Remove the air filter.
3. Remove the air filter holder and the carburetor.
Refer to
To disassemble the carburetor on page 46
.
4. Remove the spark plug.
5. Attach the inlet cover (A) and the spark plug adapter
(B). Refer to
Servicing tools on page 12
for the
correct cover and adapter.
6. Loosen the screws on the muffler and attach the
outlet cover. Refer to
Servicing tools on page 12
for
the correct cover. Tighten the screws for the muffler.
7. Connect the pressure gauge tool to the nipple on the
spark plug adapter. Refer to
Servicing tools on page
12
.
8. Increase the pressure to 0.8 bar. Wait for 30
seconds. Make sure the pressure does no decrease
to less than 0.6 bar. Remove the cover from the
muffler and the carburetor, tighten the bolts to the
correct torque. Remove the pressure test nipple and
attach the spark plug.
CAUTION: Make sure the inlet manifold is
attached correctly after the pressure test. An
incorrectly attached inlet manifold will cause
damage to the product.
8.19 Crankshaft and crankcase
8.19.1 To get access to the crankshaft and
crankcase
1. Drain the oil and the fuel.
2. Remove the cylinder cover.
3. Remove the spark plug.
4. Remove the chain brake system. Refer to
To
disassemble the chain brake on page 18
.
5. Remove the guide bar and saw chain.
6. Remove the chain catcher. Refer to
To replace the
chain catcher on page 21
.
7. Remove the chain guide plate.
8. Remove the centrifugal clutch. Refer to
To
disassemble the centrifugal clutch on page 37
.
9. Remove the lubrication system. Refer to
To
disassemble the lubrication system on page 39
.
10. Remove the muffler. Refer to
To disassemble the
muffler on page 21
.
11. Remove the starter. Refer to
To disassemble the
starter on page 29
.
12. Remove the air filter and the air filter holder. Refer to
To remove the air filter on page 68
. Remove the
start/stop switch. Refer to
To disassemble the start/
stop switch on page 23
.
13. Remove the carburetor. Refer to
To disassemble the
carburetor on page 46
.
14. Remove the ignition module. Refer to
To
disassemble the ignition system on page 34
.
15. Remove the flywheel. Refer to
To disassemble the
flywheel on page 35
.
16. Remove the fuel tank. Refer to
To disassemble the
fuel tank on model 545 Mark II and 550 XP
®
Mark II
on page 47
or
To disassemble the tank unit on 545G
Mark II and 550 XP
®
G Mark II on page 49
.
17. Remove the handle and throttle trigger. Refer to
To
disassemble the handle on page 27
.
18. Disconnect the wires.
722 - 003 - 26.03.2019 Repair instructions - 61
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