Spartan 758 Water Jet, Owner'S Manual

Page: 16 / 74

Page 16
Pulsation
Pulsation
Control
Pulsation is activated when control knob is turned “in” (see activating pulsator procedure below). As control knob is
turned in, the pulsator stem will force the inlet valve plate open, compressing the valve spring. With inlet valve held
open, center plunger cannot develop pressurized flow. Pulsating action results since only two of the three plungers
are developing pressurized flow.
S S
S S
S
!
To activate pulsator, follow these steps below:
1. Start engine. (Refer to engine operating procedure on page 13)
2. Insert jetting hose several feet into pipe opening. (Refer to setup section on page 14)
3. Advance engine to full throttle and place the reel supply valve in the “on” position (up). (Refer to operating
instructions on page 22)
4. Start turning pulsator control knob “in” (clockwise). You may start to hear a clicking sound made by the inlet
valve plate moving back and forth against pulsator valve stem. Continue turning control knob “in” until
clicking sound disappears and pulsation is evident in jetting hose. (Refer to drawing above)
WARNING: Turning pulsator control knob too far into pump will cause damage to inlet valve
plate, spring, and spring retainer. Increased resistance should be felt when valve spring is reaching
full compression. This is an indicator that you are turning pulsator control knob too far into pump.
5. Pulsation is now fully activated.
To deactivate pulsation, turn pulsation control knob completely out (counter clockwise).
NOTE: Operating pressure will decrease and fluctuate when pulsation is activated. At full throttle, pressure is
approximately 1400-1700 psi.
NO PULSATION
PULSATION