Graco Inc 239132, 239136, 239129 Troubleshooting, See Charging and Startup, See Bladder Failure

Troubleshooting

WARNING

To reduce the risk of serious injury whenever you are instructed to relieve pressure, always follow the Pressure Relief Procedure on page 7.

Relieve the pressure before checking or servicing the equipment.

Check all possible problems and causes before disas- sembling the pump.

PROBLEM	CAUSE	SOLUTION
Surge suppressor does not hold	Manual or automatic models:
pressure.	–Leaking threaded connections	–Check all threads for leaks.
	–Loose flange bolts or clamp	–See Torque Table, page 11.
	–Failed bladder or bellows	–See Bladder Failure, page 10.
	–Blocked air line to unit	–Use 1/4-in air line.
	Automatic models only:
	–One-way valve at air inlet is	–Arrow should point toward surge
	installed backwards.	suppressor.
	–Gauge shows no pressure,	–Pressure does not register on
	and pump is not running.	gauge until pump is started.
	Manual models only:
	–Faulty regulator	–Check regulator.
Dampening effect of surge	Surge suppressor installed incorrect	Surge suppressor should be
suppressor is not sufficient.	distance from pump	installed within 10 pipe diameters of
		pump discharge.
	Improper pressure charge	See Charging and Startup,
		page 8. Surge suppressor
		pressure should be 2 to 10 psi (0.01
		to 0.07 MPa, 0.1 to 0.7 bar) lower
		than system pressure.
	Surge suppressor does not hold	See surge suppressor does not hold
	pressure charge.	pressure in PROBLEM column.
	Failed bladder or bellows	See Bladder Failure, page 10.
	Surge suppressor too small for	Install larger surge suppressor.
	pump
	Automatic models only:	Remove pressure from surge
	Plugged automatic valve	suppressor, and check automatic
		valve for proper operation as
		follows:
		1. Leave air line attached to top
		half of surge suppressor.
		2. Fill top of surge suppressor
		with enough water to cover
		automatic valve.
		There should be no bubbles.
		3. Dump water out, and gently
		push automatic valve.
		Air should flow.
		4. Replace automatic valve if
		it is defective.
There is leaking around surge	PTFE sealing tape or paste is	Apply PTFE tape or paste to
suppressor fluid inlet.	needed on threads of fluid inlet.	threads. Do not overtighten plastic
		models. Hand tightening is
		recommended.

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