REASSEMBLY, ADJUST AND TEST

TM-5-3820-256-24-4 Drilling System Well Rotary Truck Mounted Air Transportable 600 Feet Capacity Model LP-12 NSN 3820-01-246-4276 Manual
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SERVICE MANUAL REASSEMBLY, ADJUST AND TEST Prior to assembly, lubricate the lower body bore, the top of the piston, the piston grooves, piston grommets, a piston setting spring guide and adjust screw using Item 1 in LUBRICANT SPECIFICATIONS. Install the exhaust stem grommet in its groove in the stem bore of the piston. Drop the inlet and exhaust valve into place at the bottom of the piston. Install the inlet valve spring with its narrow end against the valve. Press the spring down until the large coiled end snaps into the groove inside the piston. Position the exhaust stem spring over the exhaust stem. Then carefully press the stem into the stem bore of the piston. Install the piston in the body. Install one lower spring seat, spring guide, the other lower spring seat, pressure setting spring and the hex-shaped upper spring seat on the adjusting screw, in that order. Screw the upper spring seat down until the dimension from the top of the seat to the bottom of the stem head is approximately 47.6 mm (1-7/8 in). Install the lock nut. Before placing the adjusting screw and stem assembly in the governor body, check to be sure the exhaust stem and its spring are in place in the piston. Install the adjusting screw and spring assembly retaining ring. At this point make the adjustment as outlined under SERVICE CHECKS. After the adjustment is made, the top cover should be screwed on tightly until it seals the body against the entrance of any foreign matter. If necessary, install new filters in the reservoir and unloader ports. These cup-shaped filters can be intalled with head of a pencil. Perform operating and leakage tests as outlined in SERVICE CHECKS section when checking rebuilt governor. MAINTENANCE 40,000 km or 25,000 MILES Clean or replace governor filters. If cleaning use a cleaning solvent which is known to have no detrimental effect on metal or rubber material. 160,000 km or 100,000 MILES Disassemble the governor and clean and inspect all parts and replace as necessary. CTS-4079 - CHAPTER I - PRINTED IN UNITED STATES OF AMERICA Page 4

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