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Holset Air Compressors Master Repair Manual – 208-002   Component Diagrams

Cutaway View

 TOC

Holset® SS191 A/C Model

SMALL | MEDIUM | LARGE

Reference Number Part Name Quantity (Number Required)
1 Unloader cover 1
2 Washer 3
3 O-ring 1
4 Unloader pin 1
5 Spring 1
6 Capscrew 4
7 Cylinder head 1
8 Gasket 1
9 Exhaust Valve Seat 1
10 Valve disc 2
11 Valve Spring 2
12 Inlet valve cage 1
13 Inlet valve seat 1
14 Capscrew 4
15 Lockwasher 4
16 Cylinder block 1
17 Gasket 1
18 Capscrew 4
19 Lockwasher 4
20 Bottom Cover Plate 1
21 Gasket 1
22 Capscrew 2
23 Rod cap 1
24 Piston 1
25 Connecting Rod 1
26 Rings 2
27 Capscrew 4
28 Bearing cap 1
29 Gasket 1
30 Crankcase 1
31 Button 2
32 Piston pin 1
33 Power steering adapter 1
34 Power steering coupling 1
35 Capscrew 1
36 Bearing 2

Exploded View

 TOC

Holset® SS191 A/C Model

SMALL | MEDIUM | LARGE

  1. Unloader cover
  2. Washer
  3. O-ring
  4. Unloader pin
  5. Spring
  6. Capscrew
  7. Cylinder head
  8. Gasket
  9. Exhaust valve seat
  10. Valve disc
  11. Valve spring
  12. Inlet valve cage
  13. Inlet valve seat
  14. Capscrew
  15. Lock washer
  16. Cylinder block
  17. Gasket
  18. Capscrew
  19. Lockwasher
  20. Bottom cover plate
  21. Gasket
  22. Capscrew
  23. Rod cap
  24. Piston
  25. Connecting rod
  26. Rings
  27. Capscrew
  28. Bearing cap
  29. Gasket
  30. Crankcase
  31. Button
  32. Piston pin
  33. Power steering adapter
  34. Power steering coupling
  35. Capscrew
  36. Bearing.

Cutaway View

 TOC

Holset® SS296, SS296E, and SS338E A/C Model

SMALL | MEDIUM | LARGE
Spline Driven Air Compressor

Reference Number Part Name Quantity (Number Required)
1 Compressor crankcase 1
2 Air compressor crankshaft 1
3 Pipe plug 1
4 Compressor connecting rod 1
5 Compressor piston 1
6 Retaining ring 2
7 Oil ring 1
8 Compression piston ring 2
9 Compression piston ring 1
10 Compressor head 1
11 Wear plate 1
12 Exhaust valve 1
13 Valve intake spring 1
14 Intake valve 1
15 O-ring seal 1
16 Rectangular ring seal 1
17 Unloader cap 1
18 Unloading valve body 1
19 Compression spring 1
20 Compressor intake valve seat 1
21 Hexagon head capscrew 4
22 Air compressor cover 1
23 Air compressor gasket 1
24 O-ring seal 1
25 Compressor exhaust seat 1
26 Air compressor gasket 1
27 Exhaust valve spring 1
28 Piston pin 1
29 Air compressor support 1
30 Air compressor gasket 1
31 Spline coupling 1
32 Thrust bearing 1
33 Captive washer capscrew 2
34 Captive washer capscrew 2
35 Plain washer 2
36 Captive washer capscrew 4
37 Plain washer 4
38 Dataplate 1
39 Drive screw 2
40 Lockwasher 4
41 Plain washer 4

Exploded View

 TOC

Holset® SS296, SS296E, and SS338E A/C Model

SMALL | MEDIUM | LARGE
Spline Driven Air Compressor

  1. Compressor crankcase
  2. Air compressor crankshaft
  3. Pipe plug
  4. Compressor connecting rod
  5. Compressor piston
  6. Retaining ring
  7. Oil ring
  8. Compression piston ring
  9. Compression piston ring
  10. Compressor head
  11. Wear plate
  12. Exhaust valve
  13. Valve intake spring
  14. Intake valve
  15. O-ring seal
  16. Rectangular ring seal
  17. Unloader cap
  18. Unloading valve body
  19. Compression spring
  20. Compressor intake valve seat
  21. Hexagon head capscrew
  22. Air compressor cover
  23. Air compressor gasket
  24. O-ring seal
  25. Compressor exhaust seat
  26. Air compressor gasket
  27. Exhaust valve spring
  28. Piston pin
  29. Air compressor support
  30. Air compressor gasket
  31. Spline coupling
  32. Thrust bearing
  33. Captive washer capscrew
  34. Captive washer capscrew
  35. Plain washer
  36. Captive washer capscrew
  37. Plain washer
  38. Dataplate
  39. Drive screw
  40. Lockwasher
  41. Plain washer.

Cutaway View

 TOC

Holset® SS296, SS296E, and SS338E A/C Model

SMALL | MEDIUM | LARGE
Gear Driven Air Compressor

Reference Number Part Name Quantity (Number Required)
1 Compressor crankcase 1
2 Air compressor crankshaft 2
3 Pipe plug 1
4 Compressor connecting rod 1
5 Compressor piston 1
6 Retaining ring 2
7 Oil ring 1
8 Compression piston ring 2
9 Compression piston ring 1
10 Compressor head 1
11 Wear plate 1
12 Exhaust valve 1
13 Valve intake spring 1
14 Intake valve 1
15 O-ring seal 1
16 Rectangular ring seal 1
17 Unloader cap 1
18 Unloading valve body 1
19 Compression spring 1
20 Compressor intake valve seat 1
21 Hexagon head capscrew 4
22 Air compressor cover 1
23 Air compressor gasket 1
24 O-ring seal 1
25 Compressor exhaust seat 1
26 Air compressor gasket 1
27 Exhaust valve spring 1
28 Piston pin 1
29 Air compressor support 1
30 Air compressor gasket 1
31 Mounting spacer 1
32 Thrust bearing 1
33 Captive washer capscrew 1
34 Captive washer capscrew 2
35 Plain washer 2
36 Captive washer capscrew 2
37 Plain washer 4
38 Nameplate 4
39 Drive screw 1
40 Lockwasher 2
41 Plain washer 4
42 Hexagon head capscrew 4
43 Cover plate 2
44 Hydraulic pump gasket 1
45 Fuel pump gasket 1
46 Accessory drive gear 1
47 Plain washer 1
48 Twelve point capscrew 1
49 Hydraulic pump adapter 1
50 Socket head capscrew 1

Exploded View

 TOC

Holset® SS296, SS296E, and SS338E A/C Model

SMALL | MEDIUM | LARGE
Gear Driven Air Compressor

  1. Compressor crankcase
  2. Air compressor crankshaft
  3. Plug pipe
  4. Compressor connecting rod
  5. Compressor piston
  6. Retaining ring
  7. Oil ring
  8. Compression piston ring
  9. Compression piston ring
  10. Compressor head
  11. Wear plate
  12. Exhaust valve
  13. Valve intake spring
  14. Intake valve
  15. O-ring seal
  16. Rectangular ring seal
  17. Unloader cap
  18. Unloading valve body
  19. Compression spring
  20. Compressor intake valve seat
  21. Hexagon head capscrew
  22. Air compressor cover
  23. Air compressor gasket
  24. O-ring seal
  25. Compressor exhaust seat
  26. Air compressor gasket
  27. Exhaust valve spring
  28. Piston pin
  29. Air compressor support
  30. Air compressor gasket
  31. Mounting spacer
  32. Thrust bearing
  33. Captive washer capscrew
  34. Captive washer capscrew
  35. Plain washer
  36. Captive washer capscrew
  37. Plain washer
  38. Nameplate
  39. Drive screw
  40. Lockwasher
  41. Plain washer
  42. Hexagon head capscrew
  43. Cover plate
  44. Hydraulic pump gasket
  45. Fuel pump gasket
  46. Accessory drive gear
  47. Plain washer
  48. Twelve point capscrew
  49. Hydraulic pump adapter
  50. Socket head capscrew.

Cutaway View

 TOC

Holset® QE230, QE296, and QE338 A/C Model

SMALL | MEDIUM | LARGE
Gear Driven Air Compressor

Reference Number Part Name Quantity (Number Required)
1 Heavy hexagon nut 2
2 Plain washer 2
3 Air compressor spline coupling sleeve 1
4 Hexagon head capscrew 2
5 Hexagon head capscrew 2
6 Plain washer 9
7 Piston pin 1
8 Rectangular ring seal 1
9 Air compressor gasket 1
10 Oil piston ring 1
11 Unloader valve cap 1
12 Compression piston ring 1
13 Thrust bearing 1
14 Compression piston ring 1
15 Compression crankshaft 1
16 Pipe plug 1
17 Air compressor support 1
18 Captive washer capscrew 4
19 Captive washer capscrew 2
20 Compressor connecting rod 1
21 Bushing 1
22 Spline coupling hub 1
23 O-ring seal 1
24 Compressor piston 1
25 Compression spring 1
26 Support gasket 1
27 Compressor bushing crankcase 1
28 Compressor crankcase 1
29 Compressor intake valve 1
30 Compressor exhaust valve 1
31 Air compressor gasket 1
32 Air compressor gasket 1
33 Valve disc retainer 1
34 Spring washer 2
35 Nameplate 1
36 Connection gasket 1
37 Drive screw 2
38 Retaining ring 2
39 Hexagon head capscrew 1
40 Hexagon head capscrew 4
41 Compressor valve body 1
42 Compressor intake valve retainer 1
43 Cover plate 1
44 Compressor head 1
45 Unloading valve body 1
46 Air compressor inlet connection 1
47 Captive washer capscrew 4
48 Air compressor gasket 4

Exploded View

 TOC

Holset® QE230, QE296, and QE338 A/C Model

SMALL | MEDIUM | LARGE
Gear Driven Air Compressor

  1. Heavy hexagon nut
  2. Plain washer
  3. Air compressor spline coupling sleeve
  4. Hexagon head capscrew
  5. Hexagon head capscrew
  6. Plain washer
  7. Piston pin
  8. Rectangular ring seal
  9. Air compressor gasket
  10. Oil piston ring
  11. Unloader valve cap
  12. Compression piston ring
  13. Thrust bearing
  14. Compression piston ring
  15. Compression crankshaft
  16. Pipe plug
  17. Air compressor support
  18. Captive washer capscrew
  19. Captive washer capscrew
  20. Compressor connecting rod
  21. Bushing
  22. Spline coupling hub
  23. O-ring seal
  24. Compressor piston
  25. Compression spring
  26. Support gasket
  27. Compressor bushing crankcase
  28. Compressor crankcase
  29. Compressor intake valve
  30. Compressor exhaust valve
  31. Air compressor gasket
  32. Air compressor gasket
  33. Valve disc retainer
  34. Spring washer
  35. Nameplate
  36. Connection gasket
  37. Drive screw
  38. Retaining ring
  39. Hexagon head capscrew
  40. Hexagon head capscrew
  41. Compressor valve body
  42. Compressor intake valve retainer
  43. Cover plate
  44. Compressor head
  45. Unloading valve body
  46. Air compressor inlet connection
  47. Captive washer capscrew
  48. Air compressor gasket.

Cutaway View

 TOC

Holset® ST676 A/C Model

SMALL | MEDIUM | LARGE
Coupling Driven Two Cylinder Air Compressor

Reference Number Part Name Quantity (Number Required)
1 Pipe plug 3
2 Crankshaft 1
3 Support 1
4 Bushing 1
5 Thrust bearing (rear) 1
6 Thrust bearing (front) 1
7 Spline coupling hub 1
8 Hexagon head capscrew 3
9 Hexagon head capscrew 3
10 Lockwasher 3
11 Pipe plug 1
12 Plain washer 4
13 Rectangular ring seal 3
14 Unloading valve cap spring 1
15 Unloader valve cap 2
16 Unloader cap 2
17 O-ring seal 2
18 Unloader cap spring 2
19 Cover 1
20 Unloading body 2
21 Unloading valve body 1
22 Retaining clamp 1
23 O-ring seal 1
24 O-ring seal 1
25 O-ring seal 1
26 Exhaust valve 2
27 Exhaust valve spring 2
28 O-ring seal 2
29 Exhaust valve seat 2
30 Intake valve 2
31 Intake valve seat 2
32 Wear plate 2
33 Cover plate 1
34 Head gasket 1
35 Intake valve spring 2
36 Head 1
37 Hexagon head capscrew 8
38 Pipe plug 2
39 Lockwasher 4
40 Twelve point capscrew 4
41 Support gasket 1
42 Hexagon head capscrew 2
43 Access cover gasket 1
44 Access cover 1
45 Bushing 1
46 Pipe plug 1
47 Crankcase 1
48 Hexagon head capscrew 3
49 Flat head capscrew 3
50 Piston pin 2
51 Retaining ring 4
52 Piston 2
53 First compression ring 2
54 Second compression ring 2
55 Oil ring 2
56 Connecting rod 2
57 Hexagon head capscrew 4
58 Lockplate 4

Exploded View

 TOC

Holset® ST676 A/C Model

SMALL | MEDIUM | LARGE
Coupling Driven Two Cylinder Air Compressor

  1. Pipe plug
  2. Crankshaft
  3. Support
  4. Bushing
  5. Thrust bearing (rear)
  6. Thrust bearing (front)
  7. Spline coupling hub
  8. Hexagon head capscrew
  9. Hexagon head capscrew
  10. Lockwasher
  11. Pipe plug
  12. Plain washer
  13. Rectangular ring seal
  14. Unloader valve cap spring
  15. Unloader valve cap
  16. Unloader cap
  17. O-ring seal
  18. Unloader cap spring
  19. Cover
  20. Unloading body
  21. Unloading valve body
  22. Retaining clamp
  23. O-ring seal
  24. O-ring seal
  25. O-ring seal
  26. Exhaust valve
  27. Exhaust valve spring
  28. O-ring seal
  29. Exhaust valve seat
  30. Intake valve
  31. Intake valve seat
  32. Wear plate
  33. Cover gasket
  34. Head gasket
  35. Intake valve spring
  36. Head
  37. Hexagon head capscrew
  38. Pipe plug
  39. Lockwasher
  40. Twelve point capscrew
  41. Support gasket
  42. Hexagon head capscrew
  43. Access cover gasket
  44. Access cover
  45. Bushing
  46. Pipe plug
  47. Crankcase
  48. Hexagon head capscrew
  49. Flat head capscrew
  50. Piston pin
  51. Retaining ring
  52. Piston
  53. First compression ring
  54. Second compression ring
  55. Oil ring
  56. Connecting rod
  57. Hexagon head capscrew
  58. Lockplate.

Cutaway View

 TOC

Holset® ST773 A/C Model

SMALL | MEDIUM | LARGE
Coupling Driven Two Cylinder Air Compressor

Reference Number Part Name Quantity (Number Required)
1 Crankshaft 1
2 Support 1
3 Bushing 2
4 Thrust bearing (rear) 1
5 Thrust bearing (front) 1
6 Spline coupling hub 1
7 Hexagon head capscrew 4
8 Hexagon head capscrew 3
9 Lockwasher 3
10 Plain washer 4
11 Rectangular ring seal 3
12 Unloading valve cap spring 1
13 Unloading valve cap 2
14 Unloader cap 2
15 O-ring seal 2
16 Unloader cap spring 2
17 Cover 1
18 Unloading body 2
19 Unloading valve body 1
20 Retaining clamp 1
21 O-ring seal 1
22 O-ring seal 1
23 O-ring seal 2
24 Exhaust valve 2
25 Exhaust valve spring 2
26 O-ring seal 2
27 Exhaust valve seat 2
28 Intake valve 2
29 Intake valve seat 2
30 Wear plate 2
31 Cover gasket 1
32 Head gasket 1
33 Intake valve spring 2
34 Head 1
35 Captive washer capscrew 8
36 Hexagon head capscrew 4
37 Flat washer 4
38 Support gasket 1
39 Captive washer capscrew 2
40 Access cover gasket 1
41 Access cover 1
42 Crankcase 1
43 Captive washer capscrew 6
44 Piston pin 2
45 Retaining ring 4
46 Piston 2
47 First compression ring 2
48 Second compression ring 2
49 Third compression ring 2
50 Oil ring 2
51 Connecting rod 2
52 Hexagon head capscrew 4
53 Lockplate 4
54 Pipe plug 3

Exploded View

 TOC

Holset® ST773 A/C Model

SMALL | MEDIUM | LARGE
Coupling Driven Two Cylinder Air Compressor

  1. Crankshaft
  2. Support
  3. Bushing
  4. Thrust bearing (rear)
  5. Thrust bearing (front)
  6. Spline coupling hub
  7. Hexagon head capscrew
  8. Hexagon head capscrew
  9. Lockwasher
  10. Plain washer
  11. Rectangular ring seal
  12. Unloading valve cap spring
  13. Unloading valve cap
  14. Unloader cap
  15. O-ring seal
  16. Unloader cap spring
  17. Cover
  18. Unloading body
  19. Unloading valve body
  20. Retaining clamp
  21. O-ring seal
  22. O-ring seal
  23. O-ring seal
  24. Exhaust valve
  25. Exhaust valve spring
  26. O-ring seal
  27. Exhaust valve seat
  28. Intake valve
  29. Intake valve seat
  30. Wear plate
  31. Cover gasket
  32. Head gasket
  33. Intake valve spring
  34. Head
  35. Captive washer capscrew
  36. Hexagon head capscrew
  37. Flat washer
  38. Support gasket
  39. Captive washer capscrew
  40. Access cover gasket
  41. Access cover
  42. Crankcase
  43. Captive washer capscrew
  44. Piston pin
  45. Retaining ring
  46. Piston
  47. First compression ring
  48. Second compression ring
  49. Third compression ring
  50. Oil ring
  51. Connecting rod
  52. Hexagon head capscrew
  53. Lockplate
  54. Pipe plug
Last Modified:  13-Jun-2005
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Published by Jack

Hello, I'm Jack, a diesel engine fan and a blogger. I write about how to fix and improve diesel engines, from cars to trucks to generators. I also review the newest models and innovations in the diesel market. If you are interested in learning more about diesel engines, check out my blog and leave your feedback.