PRESSURE CONTROL VALVE
77
81
88
74 | 76 | 79 | 82 | 78 | 80 | 83 | 84 | 85 | 86 | 87 |
Tools or Supplies Required
♦ | Vise | ♦ | 11/16” Open end wrench | ♦ | H.E.R.O. hydraulic oil |
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♦ | 7/16” Open end wrench | ♦ | 1” Open end wrench | ♦ | |
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♦ | Teflon Tape or pipe sealant, optional * |
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1Remove pressure control knob, (ref# 74) and pull P.C. stem, (ref# 77) out to the internal stop (1/16" to 1/8") thereby releasing hydraulic pressure.
2Remove hydraulic return line, (ref# 72) from P.C. fitting, (ref# 81).
3Place 11/16" wrench on P.C. seat, (ref# 87). Turn
4Place complete valve in vise and remove seat from body, (ref# 81).
5Remove ball, (ref# 86), retainer, (ref# 85), and spring, (ref# 84) from body. Inspect ball for nicks or cuts and replace if damaged. Inspect seat at sealing edge, for signs of wear. A good condition seat will have a very small beveled at the sealing edge. The larger the bevel the more wear has taken place. Inspect retainer for wear. The retainer has a small locating hole in it. The hole should be flush or slightly beveled. The greater the wear on the ball, seat, and retainer the poorer the static pressure will be. Replace parts individually, or use repair kit, (ref# 88).
6Hold P.C. body vertical. Place spring into body, place retainer onto spring. Ensure retainer fits completely over spring. Retainer should rest below end of body by approximately 1/4" to 3/8". Place ball onto retainer, ensuring ball is located on center hole.
7Thread on seat, using care not to dislodge the ball from its position on the retainer. Tighten firmly.
8Apply pipe dope or Teflon tape to exterior threads of seat. Install into elbow. Tighten to prevent leaks and return to original position.
9Reattach hydraulic line. See "PURGING" instructions on page 19.
H.E.R.O. INDUSTRIES | 27 | Model 3000 Owner’s Manual |