MCi Crusader II 1989 Maintenance Manual page 390

Date
1-1-89
Page . __
1_2_-1_0 _ _
MC-9 MAINTENANCE M·ANUAL
3. Quickly move the overtravel lever downward approxi-
mately 2" (50.8 mm) and simultaneously start counting the
number of seconds before the vacuum gauge starts to drop off.
A delay of 1-6 seconds should exist
Method Using Air Pressure:
4. Install valve cover with
new
gasket on valve assembly.
5. Connect air pressure supply hose to air spring port
6. Move overtravel lever downward quickly approximately
2" (50.8 mm) and simultaneously start counting the seconds
before air starts to escape from the exhaust port.
A
delay of
1
to
6 seconds should exist
A time delay over 6 seconds could mean too large a valve
lever gap adjustment and a time delay under 1 second would
mean too small a valve lever gap adjustment If the time delay is
not within 1 to 6 seconds, first recheck the fluid level. If flu.id level
is satisfactory, the valve lever gap adjustment must be repeated
as set forth previously.
After obtaining proper valve adjustments, install valve cover
using new gasket Install new screen in spring port If screen
was removed from exhaust port. install new screen and exhaust
fitting.
Place tape over ends of air line ports until such time as valve
assembly is installed on the vehicle.
Bellows Port
, - , - - ~
:
~~~
I
/ , )
~ .
A,
Air Inlet Port
Air Exhaust Port
Figure
12-15.
Height Control
Valve Air
Ports.
DISASSEMBLY
OF HEIGHT CONTROL VALVE
Refer to Figure 12-16 for identification of parts.
1.
Remove inlet adapter and check valve assembly
(18)
from
valve body
(10).
Remove outlet adapter
(20).
Remove adapter
0-rings
(17).
Remove air line fitting gasket (21) from adapters.
Remove outlet adapter screen (19).
2.
Remove four cover screws and lock washers
(1)
from
cover and bracket
(2).
Remove cover. bracket and gasket
(6).
3. Position valve with delay plug (13) at top. Unscrew delay
· plug from valve body
(10).
Drain silicone fluid from cavity.
Remove plug 0-ring
(12).
Unscrew piston pin
(11)
from control
Shatt
(23).
4. Remove delay cover retaining ring (35), cover (3) and
cover 0-ring (4). Remove qelay piston (5). Discard 0-ring.
5. Remove valve lever screw and lockwasher (7) from valve
lever. Remove exhaust valve and intake valve lever
(36)
from
valve body.
6.
Remove valve stem lock clip
(8)
from stem of exhaust
valve core. Spread locking arms and slide clip from around
stem.
7. Pull overtravel assembly and shaft from valve body.
8.
Remove intake valve core
(9)
with tool (TMC/MCI Part
No. 20-35}. See figure
12-17.
9.
Remove exhaust fitting
(16)
and screen
(15),
then remove
exhaust valve core (14) with tool (TMC/MCI Part No. 20-35).
10.
Remove plug retainer
(33)
from overtravel control body
(30). Retainer must be cut off. Use caution to avoid damage to
nylon body. Remove overtravel body plug (25).
11.
Place forked end of tool (TMC/MCI Part No.
20-36)
around shaft in overtravei control body (30). then tighten clamp
screw. Refer to figure
12-18.
CAUTION: Tighten tool until Offrtravel
con-,
trol •haft (23) can be tumed 90° to allow
notch In •haft to pm fl'ff of OMrtrant pt••
ton (26). Do not apply mo,.
pntuu,.
than
Is required.
Remove overtravel control shaft
(23)
and overtravel control
body seal (29) from body. Remove shaft 0-rings (22 & 24). Back
off vise jaw and take body and tool from vise. Remove tool,
overtravel piston
(26),
overtravel lever large spring
(27),
and
overtravel lever small spring
(28)
from body. Remove lever
screw nut
(34)
from overtravel lever screw. or stud. Remove
lever
(23)
from body.
CLEANING AND INSPECTION
1. The following parts should be discarded and replaced
with new parts at each overhaul: Plug retainer
(33),
overtravel
control body seal
(29).
gasket
(6),
and 0-rings
(22, 24, 17, 12
and
4).
2. Thoroughly clean all metallic parts in a suitable cleaning
solvent Dry with compressed air.
3. Inspect all bearings and rubbing surfaces for scoring,
fractures or noticeable wear. Discard all damaged or worn
parts.and replace with
new
parts.
REASSEMBLY
CAUTION: Height control valve parts
mull
be kept fnHt from dirt and mol1ture.
1.
Install intake valve core
(9)
and exhaust valve core
(14)
with screen (15) in control body
(10)
as shown in Figure 12-17.
Tighten to
2-1 /2
to
3
inch pounds torque
(.28
to
.33
Nm). Install
exhaust fitting
(16).
2. Lubricate overtravel control body with multipurpose
grease.
3.
Install lever
(32)
on control body. Place lever stud nut
(34)
on stud and torque to 70-80 inch pounds (8.0 to 9.0 Nm).
4.
Place overtravel lever large spring
(27).
and overtravet
lever small spring
(28)
inside piston
(26).
Insert piston in control
body (30).
5. Place three new 0-rings (22 and 24) on overtravel control
.shaft
(23).
Lubricate shaft and 0-rings with multi-purpose
grease.