PREVOST H3-41 Maintenance Manual page 629

FIGURE 14: EMERGENCY EXIT VALVE
10.2.1 Without Air and/or Without Electricity
If the air pressure drops while coach has or
hasn't any electricity, the spring loaded cylinders
will unlatch the door. In such a case, unlock the
door by moving the lever on the door or by using
the key, then open the door manually.
10.2.2 With Air but Without Electricity
From inside the vehicle, turn the emergency exit
valve to the "UNLOCK" position. Move the lever.
From the exterior, turn the emergency exit valve
to the "UNLOCK" position. Open the door. Close
it, lock with the key and reset the outside
emergency exit valve to the "NORMAL" position.
10.3 DOOR CYCLE SPEED ADJUSTMENT
To do any adjustment, remove the two panels
located next to the door hinge, as well as the
door's upper hinge control.
DOOR CYLINDER
DAMPER SUPPORT
LUBRICATE PINS
SNAP RING
FIGURE 15: DOOR CYLINDER AND DAMPER
18321
GREASE FITTING
DOOR HINGE
DAMPER
PIVOT
SNAP RING
18161
PA1621 Maintenance Manual All Series
SECTION 18a: H3 SERIES BODY
CAUTION
It is important to make sure that damper does
not reach end of stroke when door is
completely closed or opened. The door
cylinder must stop the door on opening. Screw
or unscrew rod end to adjust if necessary.
To adjust opening and closing cycle speed on
damper (Figure 17):
1. Remove the damper from the vehicle and
hold it vertically with the lower eye or pin
attachment in a vice. Use clamp plates to
prevent damage.
2. Fully close the damper while turning the dust
cap or piston rod slowly CCW until it is felt
that the cams of the adjusting nut engage in
the recesses of the foot valve assembly
(Figure 17).
NOTE
In Figure 17, if there is an indentation (B) in
the dust cap (C) and the cover shows two
holes (A), the damper is fitted with a bump
rubber (D). If so, fully extend the damper and
insert a round bar or screwdriver through the
holes. Push the bump rubber down and
remove. Remove the split plastic collar (E) (if
fitted) from the piston rod.
FIGURE 16: COACH ENTRANCE DOOR
3. The damper may have already been
adjusted. Therefore check whether the
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Revised Sept 2019
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