Generac Power Systems GTH1000, Service Manual

Page: 23 / 74

Figure 3-15. Remove Secondary Lever and Spring
Figure 3-16. Remove Primary Diaphragm Cover
and Primary Spring
Figure 3-17. Remove Primary Diaphragm
Figure 3-18. Remove/Replace Two Screws 8-32 x 0.375” long
REASSEMBLY OF REGULATOR:
1. Carefully clean and inspect all metal parts-springs, levers, pivot
pins and screws. Replace all parts that are included in the repair
and rebuilding kits.
2. Carefully clean the body casting and inspect all sealing surfaces.
Wipe with a clean rag. Inspect the primary section for foreign
materials that might loosen and damage the soft face valves.
3. Blow out the fuel inlet passage and outlet passages. Be sure no
foreign material remains in these passages.
4. Inspect the primary orifice and the secondary orifice for nicks
scratches or uneven wear.
IMPORTANT! If the primary or secondary seats show any of the
above mentioned conditions, the regulator is not rebuildable and
must be replaced.
5. Lay the regulator flat on a clean working surface with the primary
section up.
6. Replace the primary pivot pin, 0.890”, bridge and two screws,
8-32 x 0.375”. Tighten screws evenly to 30 in. lbs. ±3 in. lbs.
(3.39 Nm ± 0.339 Nm). Rock the primary lever assembly to
ensure that it pivots freely. See Figure 3-18.
7. Engage the primary diaphragm pin with the slot in the primary
lever. Rotate the diaphragm to align the cover screw holes as
shown in Figure 3-19.
8. Place primary spring, small side up, on top of diaphragm. Install
primary cover and screws. Remember, the 2 longer, 10-32 x 1.0”,
screws go to the top of the primary cover. Tighten evenly, in a
criss-cross pattern, to 30 in. lbs. ±3 in. lbs. (3.39 Nm ±0.339
Nm). See Figure 3-20.
3-7
SECTION 3: CARBURETION AND FUEL SYSTEM
3