RAIN BIRD 6991 E User Manual

	RAIN	BIRD®	Customer Support Center
			6991 E. Southpoint Rd., Bldg. #1
			Tucson, AZ 85706 1-800-RAIN-BIRD

IMPACT SPRINKLER TROUBLESHOOTING GUIDE

USE AND OPERATION

The diagrams below depict typical Rain Bird sprinklers with all available controls. Your particular model may have only some of these features.

Diffuser screw: Breaks up the stream of water for more close-in watering. Shortens distance of the stream (throw) up to 25% of total throw. Screw clockwise into the stream to produce misting and shorten throw. Turn counterclockwise until totally out of stream for maximum distance (unadjusted throw).

Distance control flap:

Distance control dial:

Reduces length of the stream and redistributes water. Tilt downward into stream to deflect water. May be used in conjunction with diffuser screw for maximum throw reduction.

Some plastic models have a dial on top marked for minimum and maximum distance. Turning the dial will cause modification of the stream of water and distance of throw as indicated on the dial. This feature serves the same purpose as the distance control flap found on other models.

Arc Adjusters (Trip collar):

Used to adjust degree of arc sprinkler will rotate. Position one arc adjuster for each side of the desired arc. Several types of arc adjusters are available depending on the model of your sprinkler. Generally, plastic models move by just a push of the thumb. To adjust the metal models, pinch the ends of each metal adjuster together before sliding into position.

Trip Pin:	Used to determine part or full circle operation. Flip or bend the trip pin
	upward so it does not hit the trip collar for full circle operation. Pin should
	be downward for part circle operation (then slide arc adjusters into posi-
	tion to set degree of arc).

Diffuser Control Dial

Diffuser Control Flap

Diffuser Screw

Nozzle

Arc Adjusters

25PJDA

P5-PJ

Trip Pin

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IMPACT SPRINKLER TROUBLESHOOTING

Through many years of experience, we have found that conditions which most often interfere with the proper operation of impact sprinklers are the use of any lubricants (other than water), low water pressure, foreign materials in the irrigation water, and excessive damage or wear to sprinkler parts.

Any one or a combination of these factors can cause the sprinkler to stop rotating completely or rotate to one side and fail to return.

If your sprinkler stops working:

DON'T....Spray it with lubricant!

DON'T....Drill out the nozzle!

DO..........Disassemble and clean the unit thoroughly.

DO..........Check for sources of reduction in water pressure.

Impact Sprinkler Troubleshooting Guide

Problem	Cause	Remedy
A. Sprinkler does not	1. Insufficient	a. Remove sprinkler head and attach pressure gauge to riser. Check operat-
rotate back and forth.	water pressure. Re-	ing pressure with line running. If pressure is low. check for breaks in the line
	quirements vary	or water running elsewhere which could drain pressure.
	from model to
	model.
	Most popular mod-	b. Pop-up Models: Check for water coming out around the guide seal below
	els need at least 25	the sprinkler head. This is a pressure activated seal. if pressure is insuffi-
	psi at the last sprin-	cient, water will leak around this seal causing the unit to stall and pop up
	kler head, and	only part way. If the unit is new or others on the line have same problem, it
	should have an un-	is probably related to pressure. If the unit is older, clean or replace the
	adjusted throw of at	guide nut seal if necessary.
	least 36'.
		c. Try switching with another sprinkler closer to water source. If it works,
		then pressure could be the problem.
		d. If the sprinkler stopped working within a month or two of installation, the
		system may not have been designed to accommodate the normal operating
		pressure of the type of sprinklers installed. If metal sprinklers are being
		used, try switching to plastic. If plastic sprinklers are being used, try a lower
		gallonage variety.
		e. If measures above do not provide enough pressure boost, system may
		have to be rerouted to include less sprinkler heads per line.
A. Sprinkler does not	2. Debris in nozzle	a. Remove sprinkler and check for debris in nozzle, swivel bearing, and
rotate back and forth.	or other parts of	inlet. Sometimes, a wire pushed gently into the nozzle will loosen debris so
	sprinkler.	it can be rinsed out. Do not drill or alter nozzles as this may permanently
	Build up of water	hinder the sprinkler performance.
	deposits causing	Metal models only: If sand is caught in vane inside of nozzle, it will need to
	friction.	be removed. Loosen nozzle with wrench and unscrew.
		b. Thoroughly wash sprinkler to remove dirt and oil. A vinegar and water
		solution will help remove water deposits.
		c. Replace bearing washers if oil has been used on the sprinkler.

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Impact Sprinkler Troubleshooting Guide Continued

Problem	Cause	Remedy
	3. Worn or	a. If arm or body of sprinkler is bent or damaged, replace sprinkler or part if
	damaged parts.	available.
		b. Arm spring tension may need increasing. Metal models: Unhook spring
		from arm with needle-nosed pliers. Bend slightly to shorten and re-hook.
		Plastic Models: Unhook spring from arm with needle-nosed pliers, re-hook to
		next adjoining protrusion on arm.
		c. Replace bearing washers if less than 2/3 of original thickness, if mineral
		deposits are a problem, or if oil based products have been used.
B. Sprinkler	1. Check points for
rotates to one side	non-rotation in Sec-
and stops.	tion A, 1-3.
	2. Excessive	a. Put more heads on your line or try making adjustments in the flow at the
	water pressure. Just	valve. In some cases, installing a pressure regulator ahead of your main
	as each sprinkler	shutoff valve is a good idea and will protect your entire system.
	has a lower pressure
	limit for proper oper-
	ation, there is also
	an upper limit. For
	most sprinklers the
	limit is 80 psi at the
	head. The optimum
	operating pressure
	is around 50 psi.
	Pressure that is too
	high will, at the
	worst, cause the
	sprinkler to stall, and
	at the least, cause
	the premature wear
	of the sprinkler
	parts. If the sprinkler
	rotates or reverses
	very fast, this a fore-
	warning of exces-
	sive pressure.

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