Braking System - Pressure Converter
Section 250-0260
SM 1508 9-98
2
switch in contact assembly (17) causing converter
overstroke warning light to illuminate. This will continue
until switch is reset by manually pushing indicator rod
(15) into hydraulic cylinder body (21) until flush.
REMOVAL
Numbers in parentheses refer to Figs. 1 and 2.
Note: When removing rear pressure converter from
the machine, it is advisable to raise the body and
secure in place with the body safety prop.
WARNING
To prevent personal injury, be sure body prop
is in place before working under a raised body.
8 - 'O' Ring
9 - Air Piston
10 - Return Spring
11 - Push Rod
12 - End Cap
13 - Seal Ring
14 - 'O' Ring
15 - Indicator Rod
16 - Bleeder Screw
17 - Contact Assembly
18 - Shim (if used)
19 - Nut
20 - Lockwasher
21 - Hydraulic Cylinder
22 - Retainer Ring (if used)
23 - 'V' Seal
24 - Back-up Ring (if used)
25 - Hydraulic Piston
26 - Valve Insert
27 - Valve
28 - Retainer Ring
29 - 'V' Seal
30 - 'O' Ring
31 - Bushing
32 - 'V' Seal
1 - Air Cylinder
2 - Nut
3 - Washer
4 - Piston Follower
5 - Felt Wiper
6 - Expander Spring
7 - Leather Cup
hydraulic system for temperature expansion and
contraction or seepage. During an application, initial
push rod (11) movement seats valve (27) against
hydraulic piston (25) and seals passage to port 'C',
then the stroke displaces fluid into the brake system.
Pressure builds when this fluid movement ceases. 'V'
seal (23) on hydraulic piston (25) seals the pressure
system and hydraulic pressure is directed to the
brakes through outlet port 'D'.
Upon release, return spring (10) forces push rod (11)
to unseat valve (27) and return hydraulic piston (25) to
its stop. Displaced fluid passes through hydraulic
piston (25) to equalize hydraulic pressure and the
system returns to the static position.
When the pressure converter stroke has been exceeded,
because of a loss of hydraulic pressure in the brake
system, air piston (9) strokes indicator rod (15), closing
SM - 822
Fig. 2 - Exploded View of Pressure Converter
Courtesy of Machine.Market
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