Proheat M125 - Manual (Page 87)

NOTICE
DO NOT loosen the three screws
holding the compressor body (Figure
5-9), as it requires special tools to
install the compressor body back in
proper position.
NOTICE
The three holes in the plates are not
equally spaced. Ensure their correct
alignment to the compressor body
(Figure 5-9).
NOTICE
Never add oil to the compressor.
NOTICE
Use only non-petroleum based flushing
solvents such as GAST AH255B
Electrosolve Contact Cleaner or
similar products available from any
automotive supplies store.
4. Replace the Vanes
a) Remove three screws holding the compressor End Plate using a 9/64
hexagon key (refer to Figure 5-9).
b) Remove the End Plate and the graphite Wear Plate (located behind the
aluminum End plate) - refer to Figure 5-9. Avoid damage to the end plate.
c) Before removing the old vanes from the rotor slots, check the direction
of the bevel edge so the new vanes are installed in the same manner.
d) Remove four old vanes from the slots in the compressor rotor. Turn
the compressor rotor by rotating the blower blade to enable better
access to the vanes.
e) Spray body bore and rotor with non-petroleum based flushing solvent
(refer to Figure 5-9). NO NOT USE BRAKE CLEAN.
f) Use a clean dry cloth to remove flushing solvent from parts.
g) Place new vanes in rotor slots in the proper beveled edge direction.
h) Place a sheet of emery cloth on a smooth flat surface and rub both
sides of the Wear Plate located behind the End Plate to remove any
burrs. Use a clean dry cloth to remove any dust from the Wear Plate.
i) Remove old paint and clean the top surface of the compressor body
with a clean dry cloth. Do not leave scratches and scores.
j) Install the Wear Plate onto the compressor body and rotate to align all
three holes with the holes in the compressor body.
k) Repeat step (h) with the face of the metal End Plate. Use a clean dry
cloth to remove any dust from the metal plate and reinstall.
l) Replace the End Plate screws and tighten to 28–36 in-lbs (3.2–4.0 Nm).
m) Check that the unit rotates smooth turning the blower blade 2-3 times
n) Clean or replace the nozzle and the relief valve.
o) Replace the air filter.
p) Re-assemble heater burner head and check the air pressure (refer to
page 4-9).
q) Install Burner Head onto the Heat Exchanger and re-connect wires and
fuel line.
r) Switch the PROHEAT on and operate for at least one complete cycle.
Observe the operation.
s) There is a break-in period for the new vanes. After 100 hours of motor
operation or one month, repeat Steps 2 and 3.
5-10 PROHEAT M-SERIES G-II PCM SERVICE MANUAL