Generac Power Systems GTH760, Service Manual

Page: 23 / 76

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 sec-
tion 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