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DISPLACEMENT
PUMP
SERVICE
NOTES:
1 I
If you are using a repair kit to service the
pump,
use all the new parts, even if the
old ones look good.
The old parts will
wear faster,
making
pump service need-
ed again sooner.
Repair Kit No. 210-539
is available.
1.
2.
3.
4.
5.
6.
7.
8.
9.
2.
If possible,
have the necessary
replace-
ment
parts
ready
before
you
begin
disassembling.
Disconnect
the hoses from the displacement
pump.
Remove
the pump from its mounting,
and clamp it
in a vise.
Detach
the displacement
pump from the air motor
by unscrewing
the coupling
nut (6) and the tie rod
locknuts
(3). Remove the cotter pin (I) from the top
of the displacement
rod (46). Loosen the jam n$J4)
and
unscrew
the
connecting
rod
(9) from
the
displacement
rod. See Fig 3.
Unscrew
the tie bolts (19). Secure the displacement
pump in a vise so the outlet
housing
(26) is against
one vise jaw.
Remove
the packing
nut (34).
Push the displacement
rod down
until the piston
assembly
on the priming
rod (30) clears the intake
housing
(31).
Remove
the jam nut (15), piston
plate (371, valve
plate (36) and valve plate guide (38).
Pull the intake housing
down
off the displacement
cylinder.
Pull the priming
rod (30), intake valve,
piston
(47)
and displacement
rod (46) from the bottom
of the
cylinder
(27).
2.
Check
the outer
surface
of the displacement
rod
(46) and the inner surface
of the cylinder
(27) for
nicks, scratches
and wear. A scored rod or cylinder
will cause premature
packing
wear and leaking.
3.
When
replacing
the displacement
rod
(46) or the cylinder
(271, always
replace
all the pump packings
and glands to en-
sure a good seal.
Solvent
flush the material
from the pump
if possi-
ble.
Follow
the
Pressure
Relief
Procedure
on
45-56 ft-lb
page 5. Stop the pump at the bottom
of its stroke.
3g\
18
(flat side down I--
35 -/
IO. Secure the flats of the displacement
rod in a vise.
11. Disassemble
the intake valve.
12. Remove
the
cotter
pin
(14)
from
the
piston.
Unscrew
the
priming
rod
(30) from
the
piston.
Unscrew
the piston from the displacement
rod (46).
Be careful not to drop or damage the steel ball (16).
13. Disassemble
the
piston
assembly,
removing
the
washers
(39, 281, packings
(18) and spacer (35).
14. Remove
the throat
packings
(28, 18, 21) from
the
housing
(32).
Clean and Inspect
Parts
1.
Clean all the parts in a compatible
solvent.
Inspect
them
for
wear
and
damage,
replacing
parts
as
needed.
Lubricate
the
parts
with
chassis
lube
before assembling.
27-'----
224
29-
301
38-l
364
37'
19
4
18
(flat side up)
\I6
-28
-I
18
(flat side upl
17
(flat side down1
-4
15
TORQUE TO
50-W ft-lb
66-62 N.ml
Fig 4
306-970
7
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