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3 PT SERIES PUMPS PT / PG / PD REPAIR<br />
3.7 Adjusting Valve Clearance<br />
PT2Y / PT3Y<br />
Adjust valve clearance after first 20 hours of operation,<br />
and every 6 months or 500 hours thereafter.<br />
Set valve clearance with engine cold and piston at the top<br />
of its compression stroke.<br />
Valve Clearance Intake: 0.006" (0.15 mm)<br />
Exhaust: 0.006" (0.15 mm)<br />
3.8 Adjusting Engine Speed<br />
PT2Y / PT3Y<br />
Before making any engine adjustments, remove pump<br />
cover and check that impeller and pump housing are<br />
clean, and that impeller clearance is correct. Adjust<br />
engine to a no-load speed of:<br />
3400 ± 100 RPM. PT2Y<br />
3800 ± 100 RPM. PT3Y<br />
To adjust engine speed:<br />
1. Fill pump housing with water. This will keep pump<br />
seals cool while running engine.<br />
2. Start engine and allow it to warm up for a minute.<br />
3. Loosen locknut (b) on throttle stop screw (c). Turn<br />
screw in to decrease speed, out to increase speed.<br />
Make sure throttle lever (a) is touching stop screw<br />
before measuring RPM. Tighten locknut after correct<br />
engine speed is set.<br />
CAUTION: Running pump at a speed higher than that<br />
listed in “Technical Data” can damage pump and engine.<br />
DO NOT adjust governor setting.<br />
3-12<br />
0.006 in.<br />
(0.15 mm)<br />
a<br />
b<br />
c<br />
1003SD47<br />
1003SD48
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