Graco 222800 Series C Troubleshooting the Air Motor, Preventive Maintenance Schedule, Check Chart

Troubleshooting the Air Motor

Preventive Maintenance Schedule

The operating conditions of your particular system determine how often maintenance is required. Estab- lish a preventive maintenance schedule by recording when and what kind of maintenance is needed, and then determine a regular schedule for checking your system.

Air Motor Cylinder

Premier motors require lubrication and continuous maintenance including the replacement of the air motor cylinder casting at least every 15,000,000 cycles of use. Use Premier cylinder repair kit 16P239.

Repair or replace the Air Valve assembly (222799) whenever motor stalling or hesitation occurs. This ensures the motor does not overtravel and cause added stress to the cylinder casting.

WARNING

EXPLOSION HAZARD

Without proper maintenance, the cylin- der casting (120026) may fracture unexpectedly due to metal fatigue. This is a potentially hazardous condition and may result in serious injury. The precise life of this casting is difficult to predict

and is affected by the operating pressure, number of cycles, lubrication and air valve maintenance.

Checking the Air Motor for Leaks or Damaged Parts

If the pump is not performing well, the problem could be in the air motor. To check the air motor, perform the following steps.

1.Close the bleed-type master air valve. Disconnect the air line.

2.Remove the shroud. Refer to page 11.

3.Reinstall the air inlet fitting (22). Reconnect the air line.

4.Open the bleed-type master air valve and set the air regulator to about 0.1 MPa, 1 bar (14 psi). Observe the rocker arms and trip rods for smooth operation. Check at points A through E in Fig. 2 by listening or feeling for escaping air, or squirting a small amount of oil around the suspected leak. The oil will bubble if air is leaking. Refer to the sections noted in the Check Chart for detailed service procedures.

Check Chart

NOTE: Service the air valve every 3 million cycles. If the air motor stalls, service the air valve immediately.

Ref.	Problem		Refer to:
Letter
A	Rocker assemblies		Service	rocker	arms
	(29) not operating.		(see pages 17		and
			18).
B	Air escaping	around	Service trip rod
	trip rod or push rods.		and air valve
			(see pages 11–16).
			Service	push	rod
			seals (see pages 17
			and 18).
C	Air escaping	around	Service air valve
	air valve (25).		and air valve gaskets
			(see pages 11–16).
D	Air escaping	around	Service	slide blocks
	or out of exhaust		and air	valve	seals
	manifold (45).		(see pages 11–16).
E	Air escaping	around	Service piston and
	piston rod (4).		rod seals (see pages
			19 and 20).
F	Air motor stalls.		Service air valve (see
			the NOTE above, and
			refer to pages 11–16).
			Install the detent, trip
			rod, and air valve kits
			(see pages 21–24).

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