Make sure muffler and engine are cooled down before attempting assembly,
disassembly, or adjustments. Hot muffler and engine components can cause burns.
(9) If pressure is now between 900-1200 psi, loosen jam nut (1) on primary manifold pressure adjustment knob
(2), shown in figure 2-9, and adjust knob for desired boom pressure.
Turning knob clockwise decreases pressure; counterclockwise increases pressure.
(10) Tighten jam nut (1) and repeat steps (8) and (9) until pressure is correct.
Do not run system longer than 3 minutes after EMPTY indicator lights, or damage to pump could occur.
(11) When adjustment is complete, or if EMPTY indicator lights, set SYSTEM switch to OFF, POWER switch to
OFF, and key on engine to OFF.