33 - 4
Compressor Unit (cont'd)
Dismantling and Assembly
When Assembling
Note: Before assembling the compressor ensure that all
parts are serviceable and thoroughly clean, and that all oil
passages in the casings are clear. Use new locking plates
for screws, new joints for sealing faces and new ‘O’ rings.
When fitting new bearings use only specified type.
1 When renewing the inlet end bearings it is important
that each inner track be assembled with its respective
bearing. With the inlet/rotor casing Iying on the delivery
end face, drift the bearings (Fig. 2 (10)) into position
using service tool (tool 17) and replace the two circlips
(9).
2 Check the bearings and place the appropriate inner
tracks in a container of oil and raise the temperature to
100°C (212°F). Place a heated inner track on its
appropriate shaft and drift it hard against the shoulder
using service tool (tool 1). Repeat for the other shaft.
Assemble circlip (11) on to the male rotor shaft.
3 If it has been necessary to repair or renew the rotors or
the delivery end casing, the new delivery end clearance
must now be established (Fig. 6 (2)). To do this,
measure the dimension ‘Y’ on the rotor (4) and
dimension ‘Z’ on the delivery end casing (3). Dimension
‘Y’ must be 0.05 to 0.10 mm (0.002 to 0.004 inch)
greater than dimension ‘Z’ for correct delivery end
clearance. In isolated cases this will not be so and
therefore shims must be added to the bearing journal at
‘X’ to increase dimension ‘Y’. The checking of
dimensions ‘Y’ and ‘Z’ must be carried out on each
rotor and their respective bores in the delivery end
casing.
4 Secure fixture (tool 6) in a vice and place the rotors in
position with the female shaft in the clamping hole and
tighten the clamp securely
. This is important as
damage to grooved seal diameter may occur if the rotor
turns during later torquing up of the delivery end
bearing screws.
5 Place the delivery end casing in position over the rotor
shafts and place the selected shims on their respective
shafts. Position the first matched pair of bearings “face
to face” (Fig. 6 (1)) over the female shaft and, using
service tool (tool 8) long stud, nut and washer, pull the
bearings into the delivery end casing and onto the
shaft. Remove the tool and fit the second pair of
bearings similarly to the male shaft. Assemble the taper
circlips (Fig. 3 (11)) ensuring that the bearings are
located against the bottom of their bores. The tapered
face of the circlips should face outwards.
6 Lubricate the bearings. Assemble the spacer (18) and
oil thrower (19) onto the female rotor shaft. Lightly oil
the ‘O’ ring (20) and position the spacer - fan spigot (21)
similarly, taking care not to damage the ‘O’ ring on the
keyway.
7 Assemble the fan spigot onto the female shaft followed
by the retaining plate, and screw. Torque the screw to
100 Nm (74 Ibf/ft).
8 Fit the retaining plate, locking plate and screw to the
male shaft and similarly torque the screw to 100 Nm (74
Ibf/ft).
9 Check for correct delivery end clearance between the
ends of the rotors and the delivery end casing (Fig. 6
(2)) with a feeler gauge. Check in at least four positions
on each rotor. The correct clearance is 0.05/0.10 mm
(0.002/0.004 inch). If it is incorrect, remove the
offending rotor/s (see para 10, 'dismantling') and re-
select shims.
10 With the correct clearance established, remove the
screw, retaining plate and fan spigot from the female
shaft. Using service tool (tool 16), drift a new seal (Fig. 3
(22)) into the delivery bearing end cap (24). Lightly oil
the sealing lip and, using a new ‘O’ ring, fit the end cap
over the rotor shaft and into the casing bore. Coat its
four capscrews with JCB Lock & Seal and secure the
end cap with the screws torqued to 27 Nm (20 Ibf/ft).
11 Assemble the fan spigot with key onto the female shaft
followed by the retaining plate, locking plate and screw.
Torque the screw to 100 Nm (74 Ibf/ft).
12 Oil the rotors, release the rotor locking clamp and
check for free rotation. Re-clamp the female shaft and
lift the locking plate tabs on the female and male
bearing retaining screws.
13 Using a new joint, and JCB Lock & Seal on the
capscrews, refit the male bearing end cap, torquing the
capscrews to 27 Nm (20 Ibf/ft).
14 Fit the sling pins in the delivery end casing. Stand the
inlet/rotor casing on its engine mounting face, taking
care not to damage the locating spigot. Remove the
rotor assembly from the clamp and, using a new joint,
carefully lower the rotors into the casing (female rotor
on centre-line of engine mounting flange). Locate the
delivery end casing on the dowels. Remove the sling
pins and secure with the 7 off - M10 x 35, 1 off - M10 x
40 and 2 off - M10 x 110 bolts torqued to 54 Nm (40
Ibf/ft).
Section A
Attachments
9803/7130
Section A
33 - 4
Issue 1
Airmaster Compressor
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