DESCRIPTION
The Tecumseh HR980 4-cylinder, radial compressor is compactly packaged in a round, welded steel housing. Four pistons are actuated in their respective cylinder bores by a scotch-yoke mechanism, coupled to the compressor crankshaft.
Internal repair of the compressor is limited to replacement of shaft seal, seal seat, and pulley bearing.
Refrigerant lines are connected to the compressor with spring lock coupling type fittings. Special tools are required to disconnect the couplings.
A magnetic clutch drives the compressor shaft. When voltage is applied to the field coil, the clutch plate and hub assembly (attached to the compressor shaft) is drawn by the magnetic force toward the pulley, which rotates freely on the compressor body.
The magnetic force locks the clutch plate and hub to the pulley, causing the compressor shaft to turn with the pulley.
When voltage is removed from the clutch field coil, springs in the clutch plate and hub assembly pull the clutch plate away from the pulley. This causes the compressor shaft to stop rotating.
The compressor was first used on some 1983 models.
Note. Information on special tools required for servicing the Tecumseh HR980 compressor follows. Also appearing are instructions for replacing the shaft seal, pulley bearing, and clutch coil, as well as, instructions for leak-testing the compressor.
Exploded View of Tecumseh HR980 4-Cylinder Compressor Service is limited to shaft seal, seal seat, and pulley bearing replacement. Scheme 6
SERVICE TOOL REFERENCE NUMBERS & PART NUMBERS
| Reference Number (Tool Name) & Manufacturer | Part Number | ||
|---|---|---|---|
| 1 (Vise Holding Fixture) | |||
| Draf | AC 1191 | ||
| Robinair | 40545 | ||
| Rotunda | T57L-500-A | ||
| 2 (Clutch Holder Wrench) | |||
| Draf | AC 499 | ||
| Motorcraft | YT-499 | ||
| Robinair | 10781 | ||
| Rotunda | T81P-19623-MH | ||
| 3 (Clutch Hub Remover) | |||
| Draf | AC 1011 | ||
| Motorcraft | YT-1011 | ||
| Robinair | 10884 | ||
| Rotunda | T80L-19703-B | ||
| 4 (Pulley Spanner Wrench) | |||
| Rotunda | T83P-19623-A | ||
| 5 (Shaft Seal Protector) | |||
| Draf | AC 484 | ||
| Motorcraft | YT-415 | ||
| Robinair | 10514 | ||
| Rotunda | T71P-19703-H | ||
| 6 (Pulley Puller) | |||
| Draf | AC 451, 457, 1058 | ||
| Motorcraft | YT-457 | ||
| Robinair | 10501 | ||
| Rotunda | T71P-19703-B | ||
| 7 (Pulley Installer) | |||
| Draf | AC 1059 | ||
| Motorcraft | YT-1059 | ||
| Rotunda | T80L-19703-J | ||
| 8 (Dust Cap Remover/Installer) | |||
| Draf | |||
| Remover | AC 1194 | ||
| Installer | AC 1194 | ||
| Robinair | 10549 | ||
| 9 (Snap Ring Pliers - Internal) | |||
| Draf | AC 923 | ||
| Robinair | 14163 | ||
| 10 (Seal Seat Remover & Installer) | |||
| Draf | AC 486 | ||
| Motorcraft | YT-486 | ||
| Robinair | 10513 | ||
| Rotunda | T71P-19703-M | ||
| 11 ("O" Ring - Remover) | |||
| Draf | AC 412 | ||
| Motorcraft | YT-412 | ||
| Robinair | 10508 | ||
| Rotunda | T71P-19703-C | ||
| 12 ("O" Ring - Installer) | |||
| Draf | AC 462 | ||
| Robinair | 10509 | ||
| Rotunda | T71P-19703-L | ||
| 13 ("O" Ring - Guide & Sleeve) | |||
| Draf | AC 460 | ||
| Rotunda | T71P-19703-J, K | ||
| 14 (Seal Remover/Installer) | |||
| Draf | AC 415 | ||
| Motorcraft | YT-415 | ||
| Robinair | 10503 | ||
| Rotunda | T71P-19703-G | ||
| 15 (Pressure Test Fitting) | |||
| Draf | AC 1189 | ||
| Rotunda | T83P-19623-B | ||
| 16 (Spring Lock Coupling Tool) | |||
| Draf | AC 1175 | ||
| Motorcraft | YT-1056 | ||
| Robinair | 10968 | ||
| Rotunda | T83P-19623-C & G | ||
| 17 (Hub Installer) | |||
| Draf | AC 1052 | ||
| Motorcraft | YT-1052 | ||
| Rotunda | T80L-19703-F | ||
| 18 (Clutch Pulley Support) | |||
| Motorcraft | |||
| W/ Warner Clutch | YT-1064 | ||
| W/ Nippondenso Clutch | YT-1065 | ||
| Rotunda | |||
| W/ Warner Clutch | T80L-19703-E | ||
| W/ Nippondenso Clutch | T81P-19623-J | ||
TECUMSEH HR980 4-CYLINDER COMPRESSOR SERVICE TOOLS PART NUMBERS
REMOVE SHAFT NUT
Mount compressor on bench holding fixture. Hold clutch hub with clutch spanner wrench. Remove compressor shaft nut.
Tool Reference - No. 1 - Holding Fixture, No. 2 - Clutch Spanner Wrench
Remove Shaft Nut. Scheme 7
REMOVE CLUTCH HUB
Install clutch hub remover. Hold hub remover with a 1" wrench, while tightening bolt with a 1/2" socket wrench. Remove clutch hub and shims from compressor shaft, noting location and thickness of shims.
Tool Reference - No. 3 - Clutch Hub Remover
Remove Clutch Hub. Scheme 8
REMOVE PULLEY NUT
Using spanner wrench, remove pulley nut. Lift off pulley and field coil.
Tool Reference - No. 4 - Pulley Spanner Wrench
Remove Pulley Nut. Scheme 9
REMOVE PULLEY & FIELD COIL
If pulley and bearing assembly cannot be removed by hand, use shaft protector and puller.
Tool Reference - No. 5 - Shaft Protector, No. 6 - Pulley Puller
Remove Pulley & Field Coil. Scheme 10
REMOVE KEY
To remove clutch hub key, grip it with a side cutter and pull outward.
Remove Key. Scheme 11
REMOVE DUST CAP
Using a small screw driver or dust cap remover, pry dust cap from compressor.
| CAUTION | Use care to prevent damaging end of compressor housing. |
Tool Reference - No. 8 - Dust Cap Remover
Remove Dust Cap. Scheme 12
REMOVE SEAL SNAP RING
Using internal snap ring pliers, reach down into compressor neck and remove snap ring retaining ceramic seal seat. Thoroughly clean inside of compressor neck, shaft, and exposed portion of ceramic seal seat.
| CAUTION | Do not let any dirt or other foreign material enter compressor. |
Tool Reference - No. 9 - Internal Snap Ring Pliers
Remove Seal Snap Ring. Scheme 13
REMOVE SEAL SEAT
Insert ceramic seal seat remover into recess of ceramic seal seat. Tighten outer sleeve to firmly expand tool in seat. Remove seat by pulling tool outward, with a clockwise twisting motion.
Tool Reference - No. 10 - Ceramic Seal Seat Remover/Installer
Remove Seal Seat. Scheme 14
REMOVE "O" RING
Using "O" ring remover, lift "O" ring from inside compressor neck. Discard "O" ring.
Tool Reference - No. 11 - "O" Ring Remover
Remove "O" Ring. Scheme 15
REMOVE SEAL
Insert compressor shaft seal remover tool into compressor neck so it rests on top of shaft seal. Rotate tool clockwise, while forcing tool downward, permitting tool tangs to engage seal. Pull tool from compressor neck. Discard seal. Clean compressor neck and shaft thoroughly.
Tool Reference - No. 14 - Seal Remover/Installer
Remove Seal. Scheme 16
Scheme 17
- Coat new "O" ring with clean refrigerant oil. Place "O" ring guide over compressor shaft. Insert "O" ring into "O" ring sleeve. Insert sleeve with "O" ring over "O" ring guide and into compressor neck opening. (Scheme 17): Install "O" Ring (1 of 2)
- Insert "O" ring installer over "O" ring guide and down into "O" ring sleeve. Allow "O" ring installer to bottom against guide. Then, raise "O" ring sleeve to allow "O" ring to slip into its correct installed position. Remove "O" ring guide, sleeve and installer from compressor neck.
Tool Reference - No. 13 - "O" Ring Guide & Sleeve, No. 12 - "O" Ring Installer
Install "O" Ring (2 of 2). Scheme 18
INSTALL SEAL
- Install shaft protector over end of compressor shaft.
Tool Reference - No. 5 - Shaft Protector
- Coat shaft seal with clean refrigerant oil. Carefully engage tangs of shaft seal with slot in seal installer tool.
Tool Reference - No. 14 - Seal Remover/ Installer
Install Seal (1 of 2). Scheme 19
- Slide shaft seal and tool down compressor shaft, while turning tool. Apply light downward pressure until seal engages flats on shaft and is properly seated. Press down on tool and turn it to disengage tool from seal. Remove tool.
Install Seal (2 of 2). Scheme 20
Scheme 21
- Coat ceramic seal seat with clean refrigerant oil. Insert ceramic seal seat installer into seal seat. Turn outer sleeve to grip seat. (Scheme 21): Install Seal Seat (1 of 2)
- Install seal seat, while rotating tool in clockwise direction. This will prevent dislodging "O" ring from its groove. Remove seal seat installer and shaft protector.
Tool Reference - No. 10 - Ceramic Seal Seat Remover/Installer
Install Seal Seat (2 of 2). Scheme 22
INSTALL SNAP RING
Using internal snap ring pliers or "O" ring installer, install ceramic seal seat retaining snap ring. Install with flat face of snap ring against seal seat. Use "O" ring installer to press snap ring evenly into chamber until it snaps into its groove. To avoid damaging seal seat, do not bump or tap on snap ring.
Tool Reference - No. 9 - Internal Snap Ring Pliers, No. 12 - "O" Ring Installer
Install Snap Ring. Scheme 23
LEAK TEST SEAL
Before completing compressor assembly, install pressure test fittings on compressor. Install manifold gauge set and R-12 supply. Install shaft nut temporarily. With compressor in normal horizontal operating position, rotate compressor shaft several rotations by hand. Using a leak detector, leak test shaft seal. To remove pressure fittings, use spring lock coupling removal tool.
Tool Reference - No. 15 - Pressure Test Fittings, No. 16 - Spring Lock Coupling Removal Tool
Leak Test Seal. Scheme 24
INSTALL COIL, PULLEY & BEARING
Install dust cap in compressor neck. Install clutch coil on front of compressor with electrical connector on top. Fit slots of coil over housing lugs. Install pulley and bearing assembly on front of compressor. Bearing is a slip fit, and if properly aligned should slip easily onto compressor head. If necessary, tap pulley gently, using pulley installer and light plastic hammer.
Tool Reference - No. 7 - Pulley Installer
Install Coil, Pulley & Bearing. Scheme 25
INSTALL PULLEY NUT
Apply thread locking compound to threads of pulley and field coil retaining nut. Using pulley spanner wrench, install and tighten nut. Using pulley spanner wrench, install and tighten nut to 65-70 ft. lbs.
Tool Reference - No. 4 - Pulley Spanner Wrench
Install Pulley Nut. Scheme 26
INSTALL CLUTCH HUB
Install key in compressor shaft. Align keyway in clutch hub with shaft key. Using hub installer, install clutch hub and shims. If hub and pulley are being replaced, use 2 thickest shims from shim pack between hub and end of shaft.
| CAUTION | Do not attempt to drive hub on compressor shaft as compressor shaft as compressor damage will result. |
Tool Reference - No. 17 - Hub Installer
Install Clutch Hub. Scheme 27
INSTALL SHAFT NUT
Using spanner wrench to hold clutch hub, install and tighten compressor shaft nut to 10-14 ft. lbs. Using a feeler gauge, check air gap at 3 equally-spaced locations between clutch hub and mating pulley surface. Smallest gap should be .021-.036". To adjust, add or remove shims between clutch hub and compressor shaft.
Tool Reference - No. 2 - Clutch Spanner Wrench
Install Shaft Nut. Scheme 28
REMOVE BEARING
Perform steps 1-5 of "SEAL REPLACEMENT". Position largest opening of clutch pulley support over hub to support pulley. Drive bearing from pulley, using pulley installer.
Tool Reference - No. 18 - Clutch Pulley Support, No. 7 - Pulley Installer
Remove Bearing. Scheme 29
INSTALL BEARING
- Place clutch pulley friction face on small opening of clutch support tool. Align new bearing over clutch bearing bore. Using pulley bearing installer, seat bearing.
- Stake bearing in bearing bore, using a blunt drift at 3 equally-spaced locations around bearing. Do not use previous staking locations. Perform steps 16-19 of "SEAL REPLACEMENT".
Install Bearing. Scheme 30
REPLACE CLUTCH COIL
To replace clutch coil, perform steps 1-5 and 16-19 of "SEAL REPLACEMENT" in this article.