Table of Contents
Advertisement
Displacement Pump Service
Disassembly
When disassembling the pump, lay out all removed
parts in sequence, to ease reassembly.
NOTE: Repair Kit 222773 is available for Displacement
Pumps 222790, 237206, 237450 and 246933. The kit
includes piston and intake seals and cylinder o-rings.
For the best results, use all the new parts in the kit. Kit
parts are marked with one asterisk, for example (11*).
Repair Kits 222774 (UHMWPE/PTFE), 222775
(PTFE), 237916 (UHMWPE/leather), and 234422
(UHMWPE/Tuffstack) are available to replace the
throat packings. For the best results, use all the new
parts in the kit. Kit parts are marked with a symbol, for
example (3{). See page 32.
Repair Kit 222793 is available to service the intake
valve of Displacement Pumps 222790, 237206,
237450 and 246933. For the best results, use all the
new parts in the kit. Kit parts are marked with a sym-
bol, for example (19}).
1. Remove the displacement pump from the air motor
as explained on page 14. Place the pump in a
vise, with the jaws on the outlet housing (10).
2. Hold the flats of the priming piston rod (24) with a
12 mm wrench. Using a 22 mm wrench, unscrew
the priming piston nut (30). Slide the priming piston
(25) and piston guide (31) off the rod. Inspect the
surfaces of the guide (31) and piston (25) for
scoring, wear, or other damage.
3. Loosen the packing nut (2) using the wrench (110)
supplied, or a hammer and brass rod. Remove the
intake cylinder (23), using an adjustable wrench.
4. Unscrew the intake valve housing (17) from the
cylinder (12), using an adjustable wrench. Pull the
housing off the pump. The intake check valve
assembly (DD) should slide down the priming
piston rod (24) as you remove the housing; if it
does not slide easily, firmly tap on the top of the
housing (17) with a rubber mallet to loosen.
16
308017
Service
5. Use an o-ring pick to remove the seal (21) from
the intake valve housing (17). Discard the seal;
use a new one for reassembly. Pull the intake
valve seat (22) out the bottom of the housing (17).
If the seat is difficult to remove, insert a brass rod
through the top of the housing and drive the seat
out with a hammer. Take care not to drop the
check valve assembly (DD) as it comes free, and
set it aside for later.
6. Push the displacement rod (1) down as far as
possible, then pull it and the priming piston rod
(24) out of the outlet housing (10) and cylinder
(12).
7. Remove the packing nut (2), throat packings (5
and/or 3) and glands (4 and 6) from the outlet
housing (10). Some models include a fluid outlet
nipple (8) and o-ring (9). Do not remove these
parts from the housing unless they need replace-
ment.
8. Unscrew the bleeder valve plug (35) completely
from the valve body (43). Clean the valve threads
and the bleed hole. It is not necessary to remove
the valve body from the pump outlet housing (10).
9. Use a 400 mm adjustable wrench on the flats of
the pump cylinder (12) and unscrew the cylinder
from the outlet housing (10). Remove the o-rings
(11). Inspect the inside surface of the cylinder for
wear, scoring or other damage by holding it up to
the light at an angle or running a finger over the
surface.
10. Inspect the outer surfaces of the displacement rod
(1) and priming piston rod (24) for wear, scoring or
other damage by holding them up to the light at an
angle or running a finger over the surface.
11. Use a vise with soft jaws to hold the displacement
rod (1) by its flats. Place a 19 mm wrench on the
flats of the piston and unscrew the piston (13) and
priming piston rod (24) from the displacement rod
(1). Remove the spacer (33). Disassemble the
piston guide (14) from the piston (13).
12. It is not necessary to remove the priming piston
rod (24) from the piston (13) unless your inspec-
tion reveals scoring, wear, or other damage to
either part. To disassemble, place the piston flats
in a vise and unscrew the rod, using a 12 mm
wrench on the flats.
Advertisement
Table of Contents
