Gardner Denver GD-2250T Operating And Service Manual - page 30
301THD996 Page 21
NOTICE
The
procedure
for
fluid
end
installation is presented separately
due to the special and critical nature
of the connection between the power
end and the fluid end.
Fluid End Installation
1. Check all twelve stay rods for thread
damage or cracks. If replacement is
required,
refer
to
the
torque
specifications
on
page
34.
This
connection is critical.
2. Thoroughly clean the ends of the stay
rods. Apply a light coat of grease or
never-seize to the threads.
3. Position the fluid end on the stay rods
and slide the fluid end onto the stay
rods until it bottoms out on the stay-rod
shoulders.
4. Install the two outer-most heavy hex
nuts and hand tighten. Now it is safe to
remove the lift and sling. Install and
hand tighten the remaining heavy hex
nuts.
5. Using a hydraulic tensioning tool or
torque wrench, torque all hex nuts to the
torque specifications shown on page 34
using the sequence illustrated in Figure
4-1. These nuts MUST be kept tight.
Under-torqued nuts will lead to thread
fatigue failure of the stay-rods.
FIGURE 4-1:Fluid End Tightening
Sequence
6. Re-install the plunger clamps, piping
connections and auxiliary equipment.
Plunger and Packing Replacement
This service procedure can be performed
with the fluid cylinder in place on the pump,
and consists of the following steps:
1. Remove the suction cover retainer nut
with the appropriate male hex wrench.
2.
Remove the suction cover with a
threaded “slide hammer type” puller. If
necessary, also remove the suction
valve spring retainer.
3.
If equipped, open the hinged cover on
the top of the plungers to get access to
the plunger/extension rod area.
4.
Remove both cap screws holding the
plunger clamp, then remove clamp.
5.
Loosen the packing nut to free the
plunger from packing pre-load.
6.
Remove the plunger through the
suction cover opening.
7. Remove the packing nut, lantern gland,
packing, header ring and the spacer.
8.
Inspect the plunger, packing nut,
lantern gland, packing, header ring and
the spacer for excessive wear, nicks,
burrs, or any other defects. Replace
expendable parts as necessary.
9.
Clean and grease the packing bore in
the fluid end.
10. Install the packing in the packing bore
with the packing lips toward the front of
the fluid end. See FIGURE 4-2.
FIGURE 4-2 Packing Assembly
11. Install and hand tighten the packing nut
to align the packing in the borehole.