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Servicing Main Valve
1. See Warning above. To remove valve assembly, squeeze
snap ring ears together with snap ring pliers (P/N 995-100)
and remove snap ring from sprinkler body. See Figure 16.
2. Use valve removal tool P/N 995-08 for 835S or 995-09 for
855S to remove valve assembly from base of sprinkler body.
Valve removal tool is inserted into sprinkler body and pushed
through valve ribs. A slight twist will catch tool under ribs
enabling valve removal by pulling straight up and out. See
Figure 17.
Note: If valve removal tool is not available, use snap ring
pliers to grasp rib of valve cylinder assembly and pull up and
out of sprinkler body.
3. Reinstall valve assembly using valve insertion tool P/N 995-76
for 835S or 995-101 for 855S as follows:
• Load snap ring onto insertion tool carrier with stepped side
against carrier as shown in Figure 18. While holding snap
ring in compressed position, slide retainer clip in to hold snap
ring ears
• Load valve assembly on carrier as shown.
• Locate position of communication tube in bottom of sprinkler body and orient insertion tool accordingly.
• Insert tool straight down into sprinkler body aligning bosses on t-handle with holes on sprinkler body flange. When valve
assembly clears vertical side wall ribs inside body, pull up on snap ring release mechanism (855 models only) and press valve
assembly into position. Snap ring will lock into groove when properly installed. Remove insertion tool and check snap ring to
confirm that it is fully seated in groove
WARNING
IF THE VALVE SNAP RING IS DIFFICULT TO REMOVE, RESIDUAL WATER PRESSURE MAY BE REMAINING IN
THE SYSTEM. TO PREVENT POSSIBLE SERIOUS INJURY DUE TO VALVE BEING EJECTED UPWARD UNDER
PRESSURE, CONFIRM THE FOLLOWING CONDITIONS EXIST PRIOR TO REMOVING THE SNAP RING AND
VALVE.
A. WATER SUPPLY TO SPRINKLER IS SHUT OFF AT SOURCE.
B. ALL PRESSURE IS BLED FROM SYSTEM, INCLUDING CONTROL TUBES.
C. AC POWER IS DISCONNECTED AT SOURCE.
Figure 17Figure 16
Figure 18
Snap Ring Release
Mechanism
Stepped Side
of Snap Ring
Snap Ring In
Retainer Clip
Valve Assembly
Orientation In Carrier
Snap Ring
Released
Press Valve Assembly
Into Position