Bendix Commercial Vehicle Systems 720CC COMPRESSOR - Manual (Page 9)

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4. Remove the discharge fi tting, if applicable, and note
their position on the compressor to aid in reassembly.
5. Remove any supporting bracketing attached to the
compressor and note their positions on the compressor
to aid in reassembly.
6. Remove the six (6) mounting bolts that retain the
compressor to the side of the engine block. Note
the position of the six mounting bolts. Two of the six
bolts are shorter and must be installed in their original
locations. Remove the compressor from the vehicle.
7. Inspect drive gear and associated drive parts for visible
wear or damage. If the compressor drive gear is worn
or damaged, the compressor must be replaced. Refer
the Engine Manufacturers service manual to address
the associated engine drive parts.
8. If the compressor is being replaced stop here and
proceed to “Installing the Compressor” at the end
of the assembly procedure. (Note: Replacement
compressors come with the drive gear pre-assembled
on the compressor.)
PREPARATION FOR DISASSEMBLY
Place a clean rag over the openings that expose the
gear and crankshaft / connecting rod assembly. Refer to
Figure 3. No contamination is permitted in these areas.
Remove the balance of road dirt and grease from the
exterior of the compressor with a cleaning solvent. If the
rear end cover is being removed from the compressor,
mark it, along with the two cap screws, in relation to the
crankcase. It is also recommended to mark the relationship
of the cylinder head, cooling plate, valve plate assembly,
and crankcase.
A convenient method to indicate the above relationships
is to use a metal scribe to mark the parts with numbers or
lines. Do not use marking methods, such as chalk, that can
be wiped off or obliterated during rebuilding.
Prior to disassembly make certain that the appropriate
kits are available. Refer to Figure 8 during the entire
disassembly and assembly procedure. The serviceable
items are identifi ed by "Item" numbers 1 through 11 . These
items are also referenced in the following procedures and
are denoted by the numbers in parenthesis.
CYLINDER HEAD, COOLING PLATE & VALVE
PLATE ASSEMBLY
1. Remove the sealing ring (2) and discharge safety valve
(1) from the compressor cylinder head.
2. Remove the two short hex head screws (4) and eight
long hex head screws (3) from the compressor cylinder
head.
3. Gently tap the cylinder head, cooling plate and valve
plate assembly with a soft mallet to break the gasket
seal between the valve plate assembly and the
crankcase. Lift the cylinder head with cooling plate and
valve plate assembly off the crankcase.
4. Remove the metal inlet reed valve gasket(7).
5. Remove the two crankcase o-rings (8) from the deck
(top) of the crankcase. The o-rings are located in
countersunk holes, one on each side of the cylinder
bores.
6. Gently tap the removed cylinder head, cooling plate
and valve plate assembly with a soft mallet to break
the gasket seals. Then separate the cylinder head from
the cooling plate and valve plate assembly and remove
and discard the two head gaskets (5) and (6).
FIGURE 9 - REAR END COVER ATTACHMENT BOLTS
M10x1.5
Cap
Screws
(Larger)
M8x1.25
Cap
Screws
(Smaller)
FIGURE 10 - FRONT COVER
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