7
MS-40/MS-50 B
ACKPACK
S
PRAYER
O
PERATOR
'
S
M
ANUAL
SOLUTION :
Replace O-rings in spray pistol and on brass spindle
inside the spray gun. If these O-rings have deterio-
rated, you should also replace all other O-rings and
seals in your sprayer before leaks or other problems
occur.
Unscrew cap on bottom of spray pistol. Push up
brass spindle and replace the O-rings and washer .
1.
Empty sprayer of spraying solution. Unscrew
cap (nut) from the top of pump module and
remove. Turn sprayer upside down in order to
empty pump module. Be careful not to lose the
plastic ball inside the pump module. Once pump
module is empty, place ball back inside pump
module and place siphon tube back in pump
module, tighten cap (nut) with wrench. Make
sure it is very tight. Unit should be ready to
operate.
2.
Tighten the nut at the bottom of the pump
module with a small wrench.
3.
If cap is tightened, replace seal and screw P/N
4017000.
4.
If pump module is cracked, replace with spare
parts through your Echo dealer.
Cap may be loose. Oil the gasket (any type of 5 - 10
weight oil); this will stop the passage of fluid.
Pull check valve out. If deteriorated, replace. If not,
clean out. Place small drop of oil and reinstall.
Take a small wire and push it through the vent hole.
This will allow air into the tank and release the
vacuum. Take the cap off, clean vent hole, clean the
check valve, oil valve and re-install.
T
ROUBLESHOOTING
PROBLEM:
When you squeeze the
trigger on the spray gun, it
sticks and is slow in returning
to the shut off position when
you release the trigger.
The pin in the spray pistol
sticks when pushed. When
you release the trigger, the
pin does not come back up to
shut off the flow.
The sprayer will not pressur-
ize. You pump, but no
pressure is built up, the unit
only sprays when you pump.
Fluid is leaking from cap
where it screws into the tank
and should seal with
the tank.
Unit falls onto its side and
leaks through the center of
the cap where the check
valve is.
Unit works properly, but the
tank starts to collapse. You
can’t unscrew tank cap due
to vacuum.
CAUSE:
The O-rings have been under
chemical attack and have
deteriorated.
The O-rings and washer on
the spindle inside the spray
pistol have deteriorated from
age or chemical attack.
1.
The pump module (tube)
has lost the air pressure
head. All the air has
escaped from the top of
the pump module, due to
improperly tightened
siphon, nut, hose
assembly. The washer
that comes with the
siphon, nut, hose
assembly has deterio-
rated and is no longer
sealing properly.
2.
Split or cracked pump
module.
Because of capillary action,
fluid is being pulled through
by pressure.
Deteriorated check valve, or
could be dusty or have some
dirt or foreign matter.
The vent hole in the cap has
become clogged with dirt and
is not allowing air into the
tank.
