Cashco POSR-2 Manuel d'utilisateur télécharger pdf (Page 10)

IOM-POSR-210

21. Using a sharp, ﬂ at-edged tool, clean the gas-

ket fac ings and all surfaces where a metal-

to-metal joint occurs on the body (1), bonnet

(2), cylinder (3) and cylinder head (4).

22. Remove body (1) and bonnet (2) from vises

and solvent clean. Solvent clean all loose parts

to be reused.

23. Inspect all surfaces for wear. Replace all parts

that have excessive wear. Replace seat ring

(5) and plug-stem assembly (7) as a set. Hone

cylinder (3) if slightly grooved.

24. Lap plug-stem assembly (7) together with seat

ring (5) using a suitable lapping com pound. Do

for new re place ment parts as well as reused

parts (5, 7). Clean parts of lapping compound

with suitable solvent and let dry.

25. Place cleaned body (1) back into vise.

26. Place new seat ring gasket (6) into body (1)

cavity.

27. Insert the plug-stem assembly (7) through

the bonnet (2) and check clearance between

stem (7) and hardened bushing (18) with a

wire gauge. Normal clearance is .001–.002"

(.025–.050 mm). If excess clearance is due to

wear in stem (7), replace plug-stem assembly

(7). If clearance is due to bushing wear, place

bon net (2) under a hydraulic press and “press

out” the bushing (18); “press in” a replacement

bushing. If new bushing seems “loose” after

pressing in, place four small tack welds along

the bushing (18) OD on top of bonnet (2)-to-

bushing (18) joint, taking care to not overheat

the bushing (18) and distort.

28. Place bonnet (2) back into the second vise

held as previous.

29. Determine correct orientation of seat ring (5)

from Figure 9 herein. (DO NOT INSTALL

SEAT RING (5) UPSIDE DOWN.) Insert plug-

stem assembly (7) threaded end through seat

ring (5) and bonnet (2) bushing (18). Push seat

ring (5) into the “cage” portion of the bonnet

(2).

30. Place TFE ring gasket (13) onto upper side

of bonnet (2) and onto shoulder.

31. Place a thin ﬁ lm of lubricant onto the cylinder

(3) inside wall at the wear points of the piston

seal (12). Wipe excess lubricant away with a

clean, dry cloth.

32. Place cylinder (3) into a strap support and lift

with an overhead hoist. Swing cylinder (3) over

threaded end of plug-stem assembly (7) and

lower into the shoulder of bonnet (2), taking

care to protect ring gasket (13) of previous

article 30., above. Align match marks and

apply duct tape to hold cylinder (3) to bon net

(2).

33. Place piston (8) with recess for piston spring

(14) face down on ﬂ at surface.

34. Position a small section of the seal (12) cir-

cum fer ence around the top recess of the piston

(8). Apply an equal amount of thumb pressure

on opposing sides of the seal (12) as the seal

(12) is pressed around and over the top of the

piston (8) into the recess. NOTE: Install seal

(12) with opening of U-Cup facing upwards.

35. Place piston spring (14) into recess of piston

(8).

36. Rotate stem (7) until the tool of previous article

13., this subsection, can be inserted through

hole of stem (7). Leave the tool in the hole.

37. Carefully slide piston (8) with captured

piston spring (14) into cylinder (3). Insert a

rod or similar tool into the center hole of the

piston (8), and simultaneously lift and move

into the cylinder (3) deeper. Using ﬁ ngers of

one hand, push the plug-stem assembly (7)

together from the plug (7) end. Lift piston (8)

onto threaded portion of plug-stem assembly

(7) as far as possible, removing tool when

nec es sary. Place hand into cylinder (3) and

push the piston (8) until the piston spring (14)

begins to compress.

38. Place temporary eyenut onto threaded end of

plug-stem assembly (7). Finger-tighten eyenut

until piston spring (14) is slightly under com-

pres sion.

39. Place a rope, cable, etc., through the eyenut

and rig for overhead lifting. Simultaneously,

loos en the grip of the vise on the bonnet (2),

lift the cylinder (3) with its hoist, and lift the

partial internals subassembly (IS) with its hoist.

Con tin ue the lifting slowly until the internals

sub as sem bly (IS) is vertical. Release the strap

support from the cylinder (3). Fully release the

vise’s grip.

40. Place a round wooden peg about 2" (50 mm)

tall with ﬂ at ends, and small enough to ﬁ t within

the seat ring (5) onto a ﬂ at work surface. Swing

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 19 20

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Cashco POSR-2 Manuel d'utilisateur Page 10

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