Milton Roy Haskel 8AGD-1 Operating And Maintenance Instructions Manual Download Page 8

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Air Driven Gas Booster Compressor, 8” Drive AG Series • OM-12J

5.2.3.1

Reinstall hex plug with o-ring. Lubricate spool

seals including pilot piston seal. (Ref. 2.2.1) Insert
pilot piston into spool with bumper hanging loose on
pilot piston shaft. (Ref. Fig. 6.)

Guide in all parts by first inserting small end of spool
into interior of sleeve and seating bumper on end of
sleeve. Secure parts with retainer plate, (4) washers
and screws. Tighten screws to 30 inch pounds
torque. Retest for proper operation. If successful,
install new safety wire on cap screws.

5.2.4

If further disassembly is necessary, repeat prior

steps (5.2.1 thru 5.2.3) and then carefully remove
sleeve and second bumper.

NOTE: To remove sleeve, insert a blunt hook tool
(such as tool p/n 28584, brass welding rod or equally
soft metal) into a crosshole in the sleeve, and pull
sleeve from the valve body. (Ref. Fig. 7.)

5.2.5

Inspect (4) o-rings on sleeve and discard any

that are damaged, worn or swollen.

5.2.6

Discard second (inner) bumper if damaged or

worn.

5.2.7

Apply Haskel 50866 Lubricant liberally to all o-

rings.

5.2.8

Install inner bumper on bottom of bore in valve

body. Lay sleeve end inner o-ring on inner bumper.

With two middle o-rings installed on sleeve, slide
sleeve in against inner o-ring and bumper. Then to
“seat” fourth (outer) o-ring evenly into the groove on the end of sleeve, use bare cap/pilot piston assembly
as a seating tool.

5.2.9

Repeat installation of remaining parts per paragraph 5.2.3.1

5.3 Pilot Stem Valves

NOTE: Before repair, test according to paragraph 5.4.

Disassemble pilot valves in the following manner (while referring to your detailed assembly drawing):

NOTE: The following procedures reflect removal of the pilot valve from both the control valve end cap and
flow fitting end cap of drive section. Use applicable paragraphs depending on which pilot valve is to be
inspected and/or repaired.

5.3.1

Disconnect all plumbing lines necessary to allow separation of cycling valve assembly from position

on end cap.

5.3.2

Using suitable wrench to hold long nut. Remove bolt, lock washer and flat washer located on

topside of flow fitting.

5.3.3

Remove (2) capscrews, lock washers and flat washers located on underside of cycling valve

assembly (or flow fitting). Using care to prevent damage or loss of small parts, lift cycling valve assembly
(or flow fitting) from end cap. Remove spring, o-ring and pilot valve stem.

5.3.4

Remove flow tube and pilot tube. Inspect o-rings on ends of both tubes and replace any if damaged,

worn or swollen. Relubricate with 50866 lubricant.

5.3.5

Inspect pilot valves for damage. Replace valve if stem is bent or scratched.

5.3.6

A molded seat valve is used under the flow fitting, while a replaceable o-ring seat valve (with orifice)

is used under the cycling valve assembly. Inspect replaceable o-ring and replace if damaged, worn or

Figure 6.

Cycling valve cap and parts

ready for insertion into valve body

Figure 7.