MacDon 9200 - Page 107

MAINTENANCE/SERVICE
Cab
Air System
RETURN AIR FILTERS
Clean retum air filters every 1 00 hours, more
often in dusty conditions.
To c lean :
1. Remove filter covers at both sides of cab rear
wall by removing two nuts (A).
2. Remove foam filter
elements and clean with
compressed air.
3. Replace filter elements and cove rs .
EVAPORATOR CORE
If
air conditioning system produces insufficient
cooling, a possible cause is clogged evaporator
fins.
Fin s w ill clog up starting at the back side of
the evaporator core (again
st cab wall).
Evaporator core access and cleaning:
1. Remo ve RlH console panel (A ).
2. Relea se air suspensio n to fuUy lower
operator's seat. Tilt seat (8) forward while
ti lting sea t-back (C) rearward until se at is
vertical.
3. Lift th e acoustical foam (E) at top of
evaporator core and remo ve two nuts secu ri ng
re ta iner ( F) . Remo ve retainer.
4. Tilt evaporator core fOlWard and vacuum off
ba ck side of core (at cab wall). Use a fin
straightener to loosen clo gs .
5. Bl ow co mpressed air through core at an angle
parallel
to tubing alignment as shown . To
prevent fin dama ge , blow air direct ly at fin
edges, n ot at flat face.
6. If the comp re ssed air can not be felt at th e
back of th e core, pr oceed as follows:
Remove foam filter (D) from drain tray and
clean with warm water.
With fitter (D)
still out, pour warm wa ter down
through the core
and lea ve it to soak. ( Th e
dra in tr ay will catch an d remove run -o ff .)
7. Blow co mpressed air through the core as in
step 5. Repeat warm water soaking as
req uired until air blows th r oug h evaporator
core f
re ely.
8. Straighten any
bent fins and reassemble.
109
A
REMOVE FOR ACCESS TO
RETURN AIR FILTER
WARNING: To avoid cuts from
evaporator fins, do not use bare
hands
to brush away clogs.
A
DIR EC T AIR FLOW
PARALLEL TO TUBI NG
E
F
EVAPORATOR CORE ACCESS & CLEANING