Air Intake Maximum Restriction Values (inH
2
O)
Engine Make
GHG14, GHG17, and
GHG21 Engines
Cummins 25
Detroit 18
Table 25.2, Air Intake Maximum Restriction Values
(inH
2
O)
2.2
If air restriction exceeds the maximum al-
lowable value, operate the vehicle for one
more day, making sure not to run the en-
gine over rated rpm. Refer to the engine
operation manual for more information on
rated rpm for your engine.
2.3
If air restriction exceeds the maximum
value again, replace the air cleaner. For
instructions, refer to Group 09 of the New
Cascadia Workshop Manual.
3.
Inspect water evacuation components.
3.1
Inspect the vacuator valve(s) installed on
the hood interior and air cleaner. Make
sure the lips of each valve are undam-
aged and pliable, free of debris, and re-
main closed during inspection. See
Fig. 25.11.
3.2
Inspect the rain tray installed at the base
of the windshield. Ensure that the seal on
the forward edge of the rain tray is in
good condition.
3.3
Inspect the drain hoses installed on the
rain tray. Both hoses should be securely
attached to the rain tray and direct water
down the aft side of the front fenders.
4.
If the vehicle is equipped with an Allison auto-
matic transmission, check the automatic trans-
mission fluid level.
5.
Check for water in the fuel/water separator, if
equipped.
IMPORTANT: When draining fluid from a
fuel/water separator, drain the fluid into an
appropriate container and dispose of it prop-
erly. Many jurisdictions now issue fines for
draining fuel/water separators onto the
ground.
5.1
Place a suitable container under the fuel/
water separator.
NOTE: A hose may be used to direct water
into the container. On older DAVCO models,
the drain valve has a 1/2-inch (12.7-mm)
pipe with threads. Use a hose with a 1/2-
inch pipe thread to fit correctly and open the
drain valve by turning it one-quarter revolu-
tion. On new DAVCO models, the drain
valve has a 3/4-inch (19-mm) slip-on hose
connection; pipe threads are no longer used.
Open the drain valve by turning it one to
one-and-a-half revolutions.
5.2
If the engine is equipped with a built-in
water separator, loosen the drain valve,
and allow the water to run out. Close the
drain valve, taking care not to overtighten
it.
5.3
Detroit/Racor Models: Turn the drain plug
counterclockwise to open it.
DAVCO Models: Remove the vent cap
and open the drain. See
Fig. 25.12.
5.4
Stop draining fluid when fuel begins to
drain out.
Detroit/Racor Models: turn the drain plug
clockwise to close it.
DAVCO Models: close the drain valve.
Install and hand-tighten the vent cap.
6.
Inspect the steering components.
03/14/2016 f880940
11
1. Vacuator Valves
Fig. 25.11, Hood Vacuator Valves (hood interior shown)
Pre- and Post-Trip Inspections and Maintenance
25.10
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