The GPI HP-100C Dual-Flo
®
Piston Hand Pump is designed to
manually pump herbicides and chemical products compatible
with aluminum, fluoroelastmer and EPDM. The user has the
flexibility of operating the pump at two flowrates. A setting of
1/2-gallon provides faster high-capacity flow. A 1/4-gallon set-
ting allows for easier pumping of fluids.
Read Me!
Observe standard precautions when handling herbicides and
chemical products. Fluids to be pumped must be compatible
with pump component materials.
Damage Inspection
Upon receipt of your pump system, carefully inspect visible
components for any damage that may have occurred during
shipping. Note that the pump includes a suction pipe, dis-
charge hose, and nozzle. If any parts are damaged or missing,
please contact your distributor.
GENERAL INFORMATION
HP-100C Dual-Flo
®
Piston Hand Pump
Owner’s Manual
Use the following procedures to install the HP-100C Piston
Hand Pump on a tank with a 2-inch bung.
Install Suction Pipe
1. Remove the two protective plugs from the pump inlet and
outlet ports.
2. Wrap the threaded end of the suction pipe with 3 to 4 turns
of Teflon
®
tape.
3. Insert the suction screen into the inlet cover.
4. Place the spacer in the inlet cover to secure the inlet screen.
5. Install the suction pipe into the inlet cover and tighten firmly
with a pipe wrench.
Install Pump on Tank
1. Before installing the pump, clean the tank interior of all dirt
and foreign material.
2. Lubricate the threads of the inlet cover with Teflon
®
tape or
a thread-sealing compound approved for use with herbi-
cides and chemical products.
3. Extend the adjustable suction pipe to its full length and
carefully insert it into tank opening. The suction pipe will
adjust to the length needed and rest on the bottom of tank.
INSTALLATION
5252 East 36th Street North
Wichita, KS USA 67220-3205
TEL: 316-686-7361
FAX: 316-686-6746
“ A G r e a t P l a i n s Ve n t u r e s S u b s i d i a r y ”
www.gpi.net
1-800-835-0113
Rev. A 921334-05
02/05
Figure 1
NOTE: The suction pipe supplied has a variable length of 22 to
40 inches. If additional length is needed, order the 15-inch
Suction Pipe Extension Kit.
4. Thread the inlet fitting of the pump onto the tank and turn the
pump to tighten snugly.
NOTE: To prevent the buildup of pressure and possible herbi-
cide or chemical leakage through the nozzle, make sure the
tank is vented.
Install Hose and Nozzle Assembly
Apply 3 to 4 wraps of Teflon
®
tape to the threaded end of the
hose and hand-tighten into the outlet cover until snug.
Install Handle
The HP-100C Piston Hand Pump gives the operator a choice of
two flow settings:
• 1/4 gallon setting has low resistance and pumps 1/4 gallon
per stroke cycle.
• 1/2 gallon setting has higher resistance and pumps 1/2
gallon per stroke cycle.
Volume per stroke is determined by connecting the piston shaft
to the appropriate handle setting as outlined below. Clevis pins
may be installed from either side of handle.
1. Slide the handle grip onto the pump handle.
2. To install the links on the pump, insert a long clevis pin
through the link ends and the pump’s link holes. Secure with
a small cotter pin. (Figure 1)
3. Attach the free ends of the links to the bottom, outer
surfaces of the handle. Insert a long clevis pin through the
holes on both links and the lowest hole on the handle. Secure
with a small cotter pin. (Figure 2)
4. Insert a screwdriver in the piston shaft of the pump and pull
the piston out. Install the shaft on the handle at either piston
hole by placing a short clevis pin through the handle and the
piston shaft end and securing with the hitch clip pin.
NOTE: Select the upper piston hole on the handle for the 1/2-
gallon setting (Figure 3) or the lower piston hole for the 1/4-
gallon setting. Flow settings can be changed at any time by
repositioning the piston shaft on the handle.
