Gardner Denver FXD – 10” Operating And Service Manual - page 14
3–600 Page 8
Improper use or maintenance of relief
valves can cause excessive pressure
which may result in property damage
and/or serious personal injury or
death.
When the pump is equipped with Shear Type Relief
Valve, use only one Shear Pin of the size shown on the
setting plate. The use of a nail or any shear device other
than Vendor Shear Pin may be extremely hazardous.
Do not hammer on shear bar or stem or shear bar slot.
LUBRICATION – Recommended crankcase oils are
as shown in FIGURE 1, page 7.
Oil viscosity must not exceed 7000 SSU at startup and
must be between 1500 SSU and 130 SSU while operat-
ing, regardless of the oil temperature or grade used. A
crankcase heater and/or an oil heat exchanger may be
needed to meet these requirements.
Failure to follow these lubrication requirements will void
the warranty.
The approximate quantities of lubricant required to
properly fill the crankcases of each size pump are as
follows:
Stroke
Power
U.S
Imperial
Inches mm
End
Gallons
Gallons
Liters
5
127
FXF
3
2–1/2
11–1/2
6
152.4
FXG
4–1/2
3–3/4
17
8
203.2
FXX
12
10
46
10
254
FXD
14
11–3/4
53
10
254
FXE
14
11–3/4
53
FIGURE 2 – LUBRICATION FILL RATE
Oil must be added as required to maintain the level to
the top of the street elbow in the end of the frame. Time
between oil changes depends upon local conditions.
However, if crankcase is kept closed, it should not be
necessary to change oil any more than each 1000
working hours.
Jackshaft and eccentric shaft roller bearings are sealed
off from the crankcase lubricant and are provided with
pressure gun grease fittings. A reliable multipurpose
FIGURE 3 – PACKING TYPE PISTON
grease NLGI Grade No. 2 should be supplied to these
with discretion. Roller bearings WILL HEAT IF TOO
MUCH GREASE is used, especially if bearing is com-
pletely filled with grease.
FLUID PISTONS AND PACKING – Four general types
of fluid pistons and packings are used, depending upon
operating conditions or requirements. The pumps are
packed at the factory complete.
Low Pressure Water or Boiler Feed Service – For
low pressure water or boiler feed service, use iron or
bronze follower type pistons with fibrous duck and rub-
ber rings having regular or rock hard cure. Regular cure
rings are recommended for fluids with temperatures of
180
_
F (82.2
_
C) or lower. Rock hard rings should al-
ways be used for fluids with higher temperatures to
250
_
F (121.1
_
C) maximum. Ring lateral clearance
between the follower and piston body flange is deter-
mined by the amount of packing. Clearance should be
1/16” (1.5875 mm) for 3” (76.2 mm) width packing and
under, and 1/8” (3.1 75 mm) for width beyond 3” (76.2
mm). The rings should be installed with the end step–
cut joint gap of 1/32” (.7937 mm) for 3” (76.2 mm) diam-
eter and under, 1/16” (1.5875 mm) for 3” (76.2 mm) to
7–1/2” (190.5 mm), and 1/8” (3.175 mm) beyond 7–1/2”
(190.5 mm) diameter. All regular cure and rock hard
piston packing should be soaked at least eight hours in
warm water before installing.
High Pressure Special Fluid Service – For high pres-
sure water and mildly abrasive fluids, the cup type pis-
tons are recommended. Pistons are available in
bronze, steel, iron, monel and stainless steel. Fluids
such as acids and alkalis require special cup composi-
tions and should be referred to factory for information.
To assemble the piston to the rod, proceed as follows:
1.
Mount the hub to the taper.