Generac Power Systems GTH1000, Руководство по обслуживанию

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NOTE: test regulator on engine first or, for scheduled maintenance,
proceed to "remove regulator and dismantle as follows".
1. Make sure the fuel tank(s) have an adequate supply of fuel.
2. Make sure the valve on the tank is fully open (turned counterclock-
wise).
Note: This fuel system is under high pressure.
3. While the fuel is off, install the primary pressure test gauge at the
1/8” primary test port opening at the side of the regulator, marked
“PRI”. See Figure 3-14.
4. Disconnect the vapor hose at the Carburetor or Carburetor
Adapter.
5. Turn on the ignition to open the fuel solenoid valve.
6. If the engine is equipped with an engine controlled safety switch,
bump the starter to make contact and open the fuel solenoid valve.
7. Primary pressure should be 0.5 to 4.5 psi and hold
pressure.
8. If primary pressure is too high or too low and leakage is observed
at the vapor hose, the regulator must be re-moved, disassembled,
cleaned and new parts installed.
REMOVE REGULATOR AND DISASSEMBLE AS FOLLOWS:
*
Caution! Prior to the removal of any LP system components,
disconnect the battery and turn off the fuel supply at the tank(s).
1. Remove the five secondary cover screws, 10-32 x 0.630”, and lift
the cover off the regulator body and secondary diaphragm (see
Figure 3-13). The cover has a tendency to stick to the diaphragm
and gasket. A slight tap on the edge of the cover with a screwdriver
handle or a soft face hammer will loosen the cover.
Note: Do not pry in between the cover and the body. Damage to the
sealing surface may result.
2. After the cover has been removed, lift up an edge of the diaphragm.
Observe how it is attached to the secondary lever. See Figure 3-14.
3. Remove the two screws, 10-32 x 0.310”, holding the second-
ary lever pivot pin and remove the secondary lever and spring.
The secondary pivot pin is 1.20” long. See Figure 3-15.
Figure 3-13. Remove Five Secondary Cover Screws
4. Remove the four screws, 10-32 x 0.630”, holding the primary
diaphragm cover in place. If the cover sticks, use a screwdriver
handle or soft-faced hammer to dislodge it. Observe that the
longer (2),10-32 x 1.0”, of the six screws are at the top of the
cover. Remove primary spring. See Figure 3-16.
PRESSURE TEST POINT
Figure 3-14. Lift Edge of Diaphragm
5. Remove the primary diaphragm. See Figure 3-17.
6. Remove the two screws, 8-32 x 0.375” long. See Figure
3-18.
Note: Remove oil and foreign deposits from all chambers and
parts. DO NOT APPLY LIQUID CLEANERS TO THE DIAPHRAGMS
AND NEOPRENE FACED VALVES.
3-6
SECTION 3: CARBURETION AND FUEL SYSTEM