9
FIGURE 15 – BA-921
®
STANDARD COMPRESSOR EXPLODED VIEW
28 Crankcase
Cover
21 Crankcase
13 Cylinder Head
15 Cooling
Plate
16 Valve Plate
Assembly
4 Unloader Cover
22 Crankshaft
2 Unloader Cover Cap Screws (2)
10 Unloader Piston
6 Unloader Balance Piston
14 Head Gasket
(2)
9 O-Ring
5 Unloader Cover Gasket
27 Bottom Cover
Gasket
12 ST-4
™
Safety Valve
8 Spring
18 Piston
1 Head Cap Screws (4)
(include washers)
7 O-Ring
17 Inlet Reed Valve/
Gasket
19 Connecting
Rod
20 Bearing
Sleeve
29 Cap
Screws (4)
23 Rear Bearing
24 O-Ring
25 Rear End
Cover
26 Cap
Screws (4)
11 O-Ring
3 Unloader Cover Splash Shield
Item Qty. Description
1 4 Head Cap Screws - (Kit 4)
2 2 Unloader Cover Cap Screws - (Kit 4)
3 1 Unloader Cover Splash Shield - (Kit 4)
4 1 Unloader Cover - (Kits 2 & 4)
5 1 Unloader Cap Gasket - (Kits 2 & 4)
6 1 Unloader Balance Piston - (Kits 2 & 4)
7 1 O-Ring - (Kits 2 & 4)
8 1 Spring - (Kits 2 & 4)
9 1 O-Ring - (Kits 2 & 4)
10 1 Unloader Piston - (Kits 2 & 4)
11 1 O-Ring - (Kits 2 & 4)
12 1 ST-4
™
Safety Valve - (Kit 4)
13 1 Cylinder Head - (Kit 4)
14 2 Head Gaskets - (Kits 1 & 4)
15 1 Cooling Plate - (Kit 4)
16 1 Valve Plate Assembly - (Kit 4)
17 1 Inlet Reed Valve/Gasket - (Kits 1 & 4)
18 1 Piston
19 1 Connecting Rod
20 1 Sleeve Bearing
21 1 Crankcase
22 1 Crankshaft
Kit Notes:
Kit 1: Cylinder Head Gasket
Kit (5008558)
Kit 2: Unloader Kit (5008557)
Kit 3: Governor Adapter Kit
(5008561)
Kit 4: Cylinder Head
Assembly Kit (K023600,
K023601)
Other:
Crankcase Compressor Seal
Kit (5008559)
Unique Engine Seal Kits
are available, for Cat C7/C9
Engine, Cat C11/C13/C15/C18
Engines, and DDC Series 60
Engines
Item Qty. Description
23 1 Rear Bearing
24 1 O-Ring
25 1 Rear End Cover
26 4 Cap Screws
27 1 Bottom Cover Gasket
28 1 Crankcase Cover
29 4 Cap Screws
30 2 Governor Gasket - (Kits 3 & 4)
31 1 Governor Adapter - (Kits 3 & 4)
32 2 Bolt with Washer - (Kits 3 & 4)
30
Governor
Gasket (2)
31
Governor
Adapter
32 Bolt
with
Washer
(2)
Crankcase
Alignment
Pins
Alignment
Bushings
See Figure 10
for Port Details.
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