H.E.R.O. INDUSTRIES LTD.
1100MD OWNERS MANUAL - “B” VERSION
12
TROUBLESHOOTING
H
ydraulic
E
nergy
R
egulated
O
utput (H.E.R.O.) is more than just our name, it is the bases for the
operation of the pump. It is the regulation or control, of hydraulic energy, which allows the equipment to
build and then deliver or have an output of pressure. Once you have a basic understanding of the operation of
the equipment and the effect created in one area and how it will effect operation in another area, you will be
better able to diagnose and make repairs.
All H.E.R.O. hydrapulse membrane pumps are made up of two (2) distinct pumps. The first, and most
important pump is the hydraulic pump. The hydraulic system is made up of two valves, the hydraulic intake
valve (ref# 59) and the hydraulic outgo valve, known as the hydraulic pressure control valve (ref# 70). The
second pump is known as the paint or material pump. The paint system is made up of two basic valves, the
paint intake valve assembly (ref# 16-28), paint outgo valve, (ref# 32). For correct operation, all four valves
must be in good working condition. For this manual we will refer to the two systems as "hydraulic" and
"paint".
At the center of these two pumps is the hydrapulse membrane. The hydrapulse membrane is a flexible nylon
disc which transfers the energy (pressure) created by the hydraulic pump, to create energy (pressure) in the
paint pump. The function of the hydrapulse membrane is to create a barrier between the hydraulic oil and the
spray material and transfer the energy created.
To fully understand and trouble shoot a H.E.R.O. pump, always keep in mind that "for every action,
there is an opposite or corresponding re-action". For every action of the hydraulic intake valve (ref# 59),
there is an opposite re-action of the hydraulic outgo valve (ref# 70). At the same time there are corresponding
re-actions taking place within the paint pump. This means that as the hydraulic intake valve is opening, so is
the corresponding paint intake valve, and while the hydraulic outgo valve is closing, so is the corresponding
paint outgo valve. The operation and function of each valve is discussed at the end of this section.
For correct operation to begin, the hydraulic system must be fully primed and all air must be removed
( see "
purging
" page 16 ). Operation begins with piston in the backward position (fig.# 2). At this point the
hydraulic intake is open, while the hydraulic outgo valve is closed. The corresponding paint valves are in
similar positions.
As the piston moves forward, it pushes hydraulic oil forward. This movement of oil causes the hydraulic
intake valve to close and the hydrapulse membrane to move forward (fig.# 1). The hydraulic outgo valve will
remain closed until sufficient pressure is created to cause it to open. While the hydraulic valves are operating
a corresponding re-action is taking place in the paint valves. The forward movement of the hydrapulse
membrane pushes the paint, causing the paint intake valve, (ref# 16-28) to close. The trapped paint requires a
means of release, so it forces the outgo valve, (ref# 32), to open and paint flows to the gun.
Fig. 1
Fig. 2
The backward movement of the piston, creates a vacuum in the hydraulic system. This causes the hydraulic
outgo valve to close and the hydraulic intake valve to open (fig# 1). Opening of the hydraulic intake valve
allows a new supply of hydraulic oil to enter the system, replacing the oil which was used on the forward
stroke. Once again a corresponding re-action is taking place in the paint pump. The hydrapulse membrane
