GILLIG LOW FLOOR, Service Manual

Page: 205 / 506

205
Air System
Air Governor Removal
1. Block and hold the vehicle by means other than the air brakes.
2. Drain the air system to zero psi.
3. Disconnect governor air lines.
4. Remove the governor mounting bolts, then the governor.
Air Governor Disassembly
Call-out numbers refer to Figure 6- 14 .
Make sure you have the correct Bendix maintenance kit available to
replace parts to be discarded during disassembly.
1. Clean the governor exterior of dirt and grease.
2. If the governor cover is marked “NONADJUSTABLE” and the adjusting screw has been sheared
off, this is a nonserviceable governor and must be replaced with a new or remanufactured unit.
3. If the governor has a blue, nonmetallic cover, hold governor with one hand and, with the other
hand, grip the cover from the top and pull up with thumb until cover disengages from the gov-
ernor body. If top cover on governor is made of rubber or clear nonmetallic material, unscrew it
until it releases from the adjusting screw (4) of governor. Remove cover O-ring (20) (if present).
4. With a pair of retaining ring pliers, remove the spring assembly retaining ring (1) and save.
5. Pull the adjusting screw (4) and spring assembly out of the governor body (2).
6. Gently tap the open end of the valve body on a flat surface
to remove the exhaust stem (5), the exhaust stem spring
(6), and piston assembly (11).
7. Remove and discard the two O-rings (8) on the piston
OD, and with a hooked wire, remove and discard the O-
ring (12) from the piston ID. On non-metallic piston, the
washer and retaining ring may be removed to facilitate
removal of the O-ring.
8. If the governor has a non-metallic piston, use a small
screwdriver and carefully insert the blade between two of
the ears of the retainer ring at the bottom of the piston (11)
and pry the retainer ring (15) out of the piston and discard.
Remove the inlet/exhaust valve spring (9) and the inlet/ex -
haust valve (10) and discard. If piston assembly is metal-
lic, disengage inlet/exhaust valve spring (9) from recess
in bottom of piston, remove inlet/exhaust valve spring (9)
and the inlet/exhaust valve (10) and discard.
9. Remove and discard filters (7) from the unloader and res -
ervoir ports in the governor body.
11 9
10
8
19
16
1
4
3
2
17
18
6
5
7
8
12
Figure 6-14, Air Governor
Components