Step 1
Flip toggle switch to FILL/OFF. To
remove the top cap, begin by
loosening the top bolts 1-2 turns.
Step 3
Remove piston by squeezing the gun
trigger and pulling upward on the
piston handle.
WS137
104 S. 8th Ave. Marshalltown, IA Phone 800-888-0127 / 641-753-0127 • Fax 800-477-6341 / 641-753-6341 www.MARSHALLTOWN.com
PRIMING THE UNIT
Step 2
While pulling and holding the top cap
release pin up (red), turn the top cap
counter clockwise until it stops. Lift
up on the cap to remove.
Step 4
Fill the tank 3/4 full of drywall
compound by pouring mixed mud into
the top of the tank. Insert piston into
tank and push down until it is situated
on top of the mud. A slight twisting or
rocking motion may be necessary to
release the air trapped between the
piston and the mud.
NOTE: YOU MAY FEEL SUBSTANTIAL
RESISTANCE THE FIRST TIME YOU
TRY TO TWIST THE TOP CAP. THIS
IS CAUSED BY THE SEAL LUBRICANT
THAT WAS APPLIED PRIOR TO
SHIPPING. THIS IS NORMAL.
Step 5
Place top cap back onto the tank.
Once the top cap is securely in place,
push down the lock release to ensure
a tight fit.
5 of 14