Haier 311209J Inspection Frequency, Service Valve Stem and Seal, Adjust Needle Assembly

Service

Inspection Frequency

Dispense Valve

Inspect dispense valve at every use for leakage or other visible damage.

Heater

Every two weeks, check heater for proper resistance. Resistance should be approximately 890 ohms, +/- 70 ohms for the 240V valves. Replace heater if necessary.

Also inspect heater when performing regular mainte- nance procedures.

4.Trigger gun and use a 1/8 in. open-end wrench on flats of needle to turn needle (4a) clockwise one turn as viewed from handle end of gun.

5.Release trigger; a slight free play of the trigger han- dle should occur.

6.Repeat Step 4 until free play occurs.

7.Tighten hex nut (4g) to lock the adjustment.

Service Valve Stem and Seal

Sensor

Every two weeks, check sensor resistance. Resistance should be 108 ohms at 70° F (21° C). Replace sensor if necessary.

Also inspect sensor when performing regular mainte- nance procedures.

Adjust Needle Assembly

The trigger travel and corresponding valve opening are factory set. To adjust this setting, use the following pro- cedure.

1.Relieve pressure in system.

2.Disconnect gun from hose.

3.Use 11/32 in. wrench to loosen hex nut (4g).

If fluid leaks past seal (4c), the seal or needle (4a) may be worn or damaged. To replace seal or valve stem, use the following procedure.

1.Relieve pressure in system.

2.Disconnect gun from hose.

3.Remove cover (16), and then slide heater cartridge and sensor cartridge out of body (2).

4.Loosen needle nut.

5.Remove screws (33).

6.Unscrew needle with body from yoke.

7.Remove seal-cartridge assembly from body and replace seals and/or needle. Repack grease area of packing nut prior to reassembly.

8.Reassemble in reverse order and follow Adjust Needle Assembly, page 12.

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