2
OUTER DIAPHRAGM
CLAMP
FIGURE 1
DIAPHRAGM
GUIDE
STROKE WARNING SWITCH
FILTER
1
7
6
8
4
2
3
5
3. Observe the stroke warning light. If the master cylinder
piston seal leaks, the master cylinder, under sustained
pressure, will slowly stroke until the stroke warning switch
is activated.
REMOVAL FROM VEHICLE
1. Disconnect the hydraulic line from the delivery port of
the master cylinder and allow the hydraulic fluid to drain
into a suitable receptacle. The drainage may be
expedited by removing the reservoir cover and gasket.
2. Disconnect the air line from the rotochamber, the fluid
supply line from the master cylinder (in the case of
remote mounted reservoirs), and the electrical
connections from the stroke warning switch mounted in
the head of the rotochamber.
3. Remove the nuts from the studs which hold the mounting
brackets and remove the AH-4
™
intensifier from the
vehicle.
INSTALLING ON VEHICLE
1. Remount the AH-4
™
intensifier, reconnect the air delivery
line to the rotochamber and the electrical connections
to the stroke warning switch.
2. In the case of remote mounted reservoir, reconnect the
reservoir to the master cylinder.
3. Before adding hydraulic fluid, cycle the AH-4
™
intensifier
very carefully by making a very light brake application.
The rotochamber should extend to full stroke and operate
the stroke warning switch, causing the warning light to
come on in the cab. This will test the stroke warning
system. Release the application and reset the stroke
warning switch.
4. Remove plugs, reconnect the fluid lines and bleed the
master cylinder. The master cylinder itself may be bled
by gravity by filling the reservoir and opening the bleeder
fitting opposite the discharge port. When clear fluid flows
from the bleeder fitting, it may be closed. If the rest of
the system needs bleeding, it may be done by opening
the appropriate bleed fitting and cycling the AH-4
™
intensifier. Hydraulic brake fluid equivalent to DOT 3
specifications should always be used. Some AH-4
™
intensifier units are designed to be used with mineral
oil, in which case, the reservoir cover will clearly so
designate. Rubber parts for use with mineral oil are color
coded. Reservoir gasket diaphragm is green, seals and
o-rings are brown.
TERMINAL PER SAE
1858 2 - PLACES
PUSH TO RESET
2.45
PUSH PLATE
PUSH ROD
INNER
DIAPHRAGM
CLAMP
DIAPHRAGM
