Carrier Compressor and Condensing Unit specifications Lubrication System, Torque Values

Table 6 — Torque Values

SIZE		THREADS	TORQUE
DIAM			RANGE	USAGE
(in.)		PER IN.	(lb-ft)
1/16		27 (pipe)	8-12	Pipe Plug — Crankshaft
1/4		18 (pipe)	20-25	Pipe Plug — Crankcase
1/	4	20	8-10	Conn. Rod Cap Screw
			8-12	Junction Box
			3-5	Sight Glass
1/4			14-18	Oil Pump Drive Segment
		28	14-18	Unloader Valve
			14-18	Discharge Valve Stop
			12-15	Head Gasket Positioning Screw
5/16			15-24	Cover Plate — Pump End Bearing
		18 (pipe)		Head
			15-24
				Discharge Service Valve (4 cyl)
			30-40	Bottom Plate — Crankcase
3/8			30-40	Compressor Foot
		16	30-40	Terminal Plate
			25-30	Oil Plug — Pump End Bearing Head
			2-4	Terminal Bolts
3/8		18 (pipe)	30-40	Pipe Plug — Junction Box
7/16		14	55-65	Motor End Cover
			55-65	Pump End Bearing Head
1/2			90-100	Cylinder Head
		13	90-120	Discharge Service Valve (6 cyl)
			90-120	Suction Service Valve (4 cyl)
5/	8	11	90-120	Suction Service Valve (6 cyl)
			90-120	Rotor Lock — Crankshaft
5/8		18	60-75	Oil Drain Plug
3/4		16	105	Stator Lock
No. 6		32	1-2	Check Valve Body — Crankcase
No. 10		32	4-6	Oil Pump Drive Segment
			4-6	Terminal Screw

Lubrication System

TESTING OIL PUMP — An oil pressure tap is located above oil pump cover plate (Fig. 12). Oil pressure should be 12 to 18 psi above suction pressure.

Oil Filter Screen — Screen is accessible through bottom cover plate. Remove and inspect strainer for holes and dirt. Clean it with solvent and replace.

OIL PUMP AND BEARING HEAD — The oil pump assem- bly is contained in the pump end bearing head aluminum casting. (The pump end main bearing is a machined part of this casing — no insert bearing.)

Remove Bearing Head — Remove bearing head from crank- case and disassemble oil pump. Drive segment cap screws must be removed before bearing head can be removed (Fig. 12). Remove pump vane assemblies from both sides of the bearing head by pushing against the bearing side of the rotor. Check all parts (Fig. 13) for wear and damage.

Replace Bearing Head

1.Install the rotor retaining ring in the ring groove of the pump rotor with chamfered edge toward compressor. Compress retaining ring, and insert pump rotor into bearing head.

2.Place the pump vanes, pump vane spring with guides, and snap rings into the bearing head. Compress the springs and force the snap rings into their grooves. (Insert snap rings with flat side against casting.)

3.Bolt bearing head to crankcase (use 55 to 65 lb-ft torque). Bolt drive segment to crankshaft.

4.Insert the oil feed guide vane with large diameter inward. Place oil feed guide vane spring over small diameter of guide vane.

5.Install pump cover plate.

REMOVE 8 CAP

SCREWS

OIL

PRESSURE

TAP

PUMP END

BEARING HEAD

DRIVE SEGMENT

CAP SCREWS

OIL FEED GUIDE VANE

AND SPRING

COVER

PLATE

Fig. 12 — Removing Pump End Bearing Head

1

2

3

4

5

LEGEND

1— Pump End Bearing Head

2— Drive Segment

3— Oil Feed Guide Vane

4— Oil Feed Guide Vane Spring

5— Cover Plate

Fig. 13 — Pump End Bearing Head Assembly

13