Magnum Venus Plastech HIS Troubleshooting Manual - Manual (Page 22)

Page 20
H.I.S. Troubleshooting Manual
exposed for damage.
Remove and replace any
worn or damaged O-rings.
Examine spool for
excessive wear. Replace it
if worn or damaged.
Replace damaged or
broken springs.
Reassemble following
procedure in manual.
Valve spool assembly out
of adjustment Remove power head
assembly from pump.
Remove spring retainers,
detent trip springs, and
balls from power head.
Turn power head upside
down and remove snap
ring. Pull entire valve spool
assembly out of power
head. Place valve spool
assembly in vise (valve
spool facing up) and
remove in order; lock nut,
upper valve keeper, and
valve spool. Loosen jam
nut and remove upper valve
rod from lower valve rod.
Clean threads of upper
valve rod and screw rod
back into lower valve rod
until it bottoms out. Use
serviceable locktite.
Tighten jam nut against
lower valve keeper. Place
valve spool over upper
valve rod until it rests on
lower valve keeper (O-ring
end of valve spool facing
down). Screw upper valve
keeper onto upper valve
rod hand tight against valve
spool. Screw lock nut on to
upper valve rod. With
suitable wrench back off
upper valve keeper from
valve spool approximately