-4-
Installation Instructions
All Models — Open Center Systems
Models include Tank Port Adapter with built in Check Valve
Assembly and Pressure Port Adapter.
HM2C and HM4C Models Only — Closed Center and
Small Open Center Systems.
Models include Tank Port Adapter with built in Check Valve
Assembly and Pressure Port Adapter with three different
size metering orifices and HM4C models. Remove orifice for
use with closed center systems with flow control such as
John Deere closed center systems. Also remove for small
open center systems with a maximum flow of 8 gpm [30.28
lpm] for HM2C Model; 10 gpm [37.85 lpm] for HM4C Model.
If necessary, the pressure port adapter may be used without
a metering orifice installed in any closed center system,
provided the pressure differential across the hydraulic motor
does not exceed 1800 psi (12.4 Mpa).
Vent
Line
Agitators
Shut-off Valve
Line
Strainer
Boom
Shut-off
Valve
Line
Strainer
Control
Valve
Agitation
Line
Valve
Line
Strainer
Pressure
Gauge
Figure 4
Plumbing Hook-up
Positive Vent Line
To Boom Nozzles or Spray Gun
Preliminary to Mounting
Consult the owners manual to determine the type and capacity
of the hydraulic system. Make sure the hydraulic system is
recommended to operate with a continuous load. Refer to the
Pump Selection Guide to confirm you have the proper pump for
your hydraulic system.
Check to see that the Pump Impeller can be turned by hand.
(Turn the shaft clockwise using a deep socket wrench on the
impeller nut.) If it cannot be turned, open the Pump Casing to
look for obstructions. Clean out any corrosion build up where
the casing fits over the eye of the Impeller.
The Inlet Line
To get the full capacity from the pump, the inlet line should be
the same size as the pump inlet port. A smaller size line can be
used to lower pump output, but the inlet line must be at least
one size larger than the outlet line. (Example: If the outlet line
is 3/4"[19 mm], use 1" [25.4 mm] inlet line.) The line must be
free of air leaks. Use good quality hose that cannot be
collapsed by suction. Relief valves are not normally
recommended to regulate spray pressure with centrifugal pumps.
Strainer Installation
While line strainers are recommended on the inlet side for roller
pumps, piston pumps and other positive displacement pumps,
the recommended placement of a strainer for a centrifugal
pump is in the outlet line. This will eliminate any possible
restriction that the strainer could create if it were installed in the
inlet side.
The best location in the discharge line is immediately after the
pump. The alternate location is in the inlet side if the strainer’s
capacity is adequate for the pump’s required flow. If the
strainer is installed in the inlet side, the strainer screen should
be checked regularly to prevent clogging that will result in
cavitation.
Priming the Pump
The Pump must not be run dry.
Before starting the pump, the inlet line and pump must be filled
with liquid and all discharge lines must be open. On self-priming
models, only the pump chamber needs to be filled with liquid.
The pump must not be run unless it is completely filled with
liquid because there is a danger of damaging the mechanical
seal, which depends on the liquid for its lubrication.
Non-self-priming models should be mounted below the level of
the liquid. The suction line should slope down to the pump and
be free of dips and bends. If this cannot be done, a foot valve
should be installed in the end of the inlet line so that the line can
be completely filled with liquid before starting the pump.
For best priming results, the top vent plug should be removed
from the pump casing, and a vent line (1/4" [ 6.35 mm] tubing
is sufficient) should be installed running back to the top of the
tank. This line prevents air lock, and allows the pump to prime
itself by bleeding off trapped air. The small stream of liquid that
returns to the tank during operation is negligible. The discharge
from this line should be positioned in the tank above the high
liquid level. Self-priming models can be primed by removing the
top vent plug and filling the priming chamber. The priming
chamber will fill to the level of the inlet port. After use, the priming
