Walbro Carburetor Servicing - Toro 51603 Maintenance And Repair Manual

DISASSEMBLY, REPAIR,
REASSEMBLY
INSTRUCTIONS
WALBRO CARBURETOR SERVICING
-Metering Diaphragm Cover
Metering Lever
Inlet Needle
-Metering Diaphragm Assembly
Metering Diaphragm Gasket
V
Circuit Plate Assembly
Circuit Plate Gasket
Circuit Check Valve
Throttle Valve Screw
Throttle Valve
,Idle Needle
Hi Speed Needle
Fuel Inlet Screen
Throttle Shaft Assembly
Fuel Pump Diaphragm
Fuel Pump Gasket
Fuel Pump Cover
Idle Adjust Screw
Figure 22
Carburetor Disassembly (Refer to Fig. 22):
1. Remove the fuel pump cover screw and pump
8.
Remove the metering diaphragm and gasket.
9. Inspect the metering diaphragm for holes, dirt
2. Remove the fuel pump diaphragm and fuel pump and foreign matter.
10. Remove the metering lever screw and metering
3.
Inspect the diaphragm for flatness and continu- lever components including lever, pin, needle
11. Remove the circuit plate screw with the dia-
cover.
gasket.
ity. The diaphragm should have
no
holes. The valve and spring.
flapper valves should be flat and free ,from
curling.
phragm and gasket.
4. Blow through the external pulse hole on the
body casting to insure that there are no
ob-
structions.
12. Remove the high and low speed adjustment
n e e d l e
5. Blow through the internal fuel hole on the body
casting to insure that there are no obstructions.
13. Thoroughly inspect and clean the carburetor,
especially all small orifices and openings, using
a solvent wash and an air gun.
6. Remove and discard the filter screen.
7 . Remove the four screws and metering dia- operation of the throttle valve and lever.
!
14. Dry the carburetor with air and inspect the
phragm plate.
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