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

Service

12 311209J

Inspection Frequency

Inspect dispense valve at every use for leakage or other

visible damage.

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.

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.

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).

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.

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.