Section 250-0260
SM 1508 9-98
1
BRAKING SYSTEM - Pressure Converter
DESCRIPTION
There are two pressure converters used in the air
system one for the front brake tank and the other for
the rear. The front pressure converter is mounted off
of a bracket on the front left hand cab leg. The rear
pressure converter is mounted alongside the rear
brake tank in the trailer frame.
The pressure converters are used to convert air
pressure to hydraulic pressure. Air pressure applied to
one end of the pressure converter results in hydraulic
pressure at the other end. The pressure converter
consists of an air cylinder group and a hydraulic group.
There are 4 line connections to each pressure
converter as follows:
Port 'A' - Supply air line from relay emergency valve
Port 'B' - Air line to air breather
Port 'C' - Hydraulic line to brake fluid reservoir
Port 'D' - Supply line to hydraulic brake lines
OPERATION
Numbers in parentheses refer to Figs. 1 and 2.
When the operator depresses the brake treadle valve,
air from the treadle valve enters inlet port 'A' of air
cylinder body (1), via the relay emergency valves. The
air then forces piston follower (4), air piston (9) and
push rod (11) to stroke hydraulic cylinder (21) and
compress return spring (10). Piston follower (4)
contains a leather cup (7) and a felt wiper (5) that
cleans and lubricates air cylinder body (1) housing. Air
displaced on the atmospheric side of air piston (9)
passes through port 'B' in hydraulic cylinder body (21)
to the air breather. Refer to Section 250-0270, AIR
BREATHER.
When air is released, return spring (10) forces push
rod (11), air piston (9) and piston follower (4) back to
the static position. In the static position, valve (27) is
open, allowing fluid in hydraulic cylinder body (21) to
pass through hydraulic piston (25) and port 'C' to the
remote brake fluid reservoir to compensate the closed
25 - Hydraulic Piston
26 - Valve Insert
27 - Valve
28 - Retainer Ring
29 - 'V' Seal
30 - 'O' Ring
31 - Bushing
32 - 'V' Seal
17 - Contact Assembly
18 - Shim (if used)
19 - Nut
20 - Lockwasher
21 - Hydraulic Cylinder Body
22 - Retainer Ring (if used)
23 - 'V' Seal
24 - Back-up Ring (if used)
9 - Air Piston
10 - Return Spring
11 - Push Rod
12 - End Cap
13 - Seal Ring
14 - 'O' Ring
15 - Indicator Rod
16 - Bleeder Screw
1 - Air Cylinder Body
2 - Nut
3 - Washer
4 - Piston Follower
5 - Felt Wiper
6 - Expander Spring
7 - Leather Cup
8 - 'O' Ring
Fig. 1 - Cutaway View of Pressure Converter
SM - 821
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