Specifications

SECTION VI. PERIODIC MAINTENANCE

6-1.

OVERVIEW. This section describes preventive

maintenance for the Rosemount Model PP814T Power

Positioner. Preventive maintenance is necessary at

specific intervals to reduce wear and tear on the

power positioner.

6-2.

TIME INTERVAL

(APPROXIMATE)

6 months

2 years

6-3.

MAINTENANCE SCHEDULE. Use the

maintenance schedule, Table 6-1, as a guideline for

preventive mai”tenance. The frequency of this

maintenance varies directly with plant conditions and

operational load on the power positioner. Extremely

dusty conditions or high temperatures will require

more frequent maintenance on the power positioner.

GENERAL CLEANING AND LUBRICATION.

Clean power positioner exterior of all grease buildup

with commercial dry cleaning solvent. To lubricate

power positioner, refer to Figure 6-1, Lubrication

Chart.

Table 6-1. Maintenance Schedule.

MAINTENANCE ACTION

Perform general cleaning and lubrication. Refer to paragraph 6-3.

Clean and inspect pilot valve. Refer to paragraph 6-4.

Clean and drain air filter. Refer to paragraph 6-5.

Clean and inspect diaphragm. Refer to paragraph 6-6.

Clean and inspect air lock diaphragm. Refer to paragraph 6-7.

Clean and inspect exhaust blocking valve. Refer to paragraph 6-8.

Lubricate, clean and inspect cylinder and piston assemblies. Refer to paragraph 6-9.

Lubricate, clean and inspect mechanical linkage. Refer to paragraph 6-10.