Section 250-0260
SM 1508 9-98
3
3. Remove contact assembly (17) and shim (18), if
used, from hydraulic cylinder body (21).
4. Remove bleeder screw (16), end cap (12) and seal
ring (13) from hydraulic cylinder body (21). Discard
seal ring (13).
5. Match mark air cylinder body (1) and hydraulic
cylinder body (21) and remove nuts (19) and
lockwashers (20). Remove air cylinder body (1).
6. Remove retainer ring (22), if used, indicator rod (15)
and 'O' ring (14). Discard 'O' ring (14) and retainer ring
(22), if used.
WARNING
Return spring (10) is under tension. Remove
nut (2) slowly, being careful to control
expansion of return spring (10) to avoid
property damage or personal injury.
7. Remove nut (2), washer (3), piston follower (4),
leather cup (7), 'O' ring (8), air piston (9) and return
spring (10) from air cylinder body (1). Discard leather
cup (7), 'O' ring (8) and return spring (10).
8. Remove expander spring (6) and felt wiper (5).
Discard felt wiper (5).
9. Unscrew bushing (31), push rod (11) and hydraulic
piston (25) as an assembly from hydraulic cylinder
body (21). Do not remove bushing (31) from push rod
(11) at this time.
10. Disconnect retainer ring (28). Remove hydraulic
piston (25), valve (27), valve insert (26) and retainer
ring (28). Discard retainer ring (28) and seal (26).
11. Slide bushing (31) off push rod (11) end. Remove
and discard 'V' seals (29 & 32) and 'O' ring (30) from
bushing (31).
12. Remove and discard 'V' seal (23) from hydraulic
piston (25). Back-up ring (24), if used, should not be
removed
INSPECTION
Numbers in parentheses refer to Figs. 1 and 2.
1. Using mineral spirits, clean air cylinder body (1),
piston follower (4), expander spring (6), air piston (9),
push rod (11), hydraulic cylinder body (21), hydraulic
piston (25), valve (27) and bushing (31).
Braking System - Pressure Converter
1. If required, to remove the rear pressure converter,
raise body and secure in place with the body safety
prop.
2. Switch off the engine, install steering lock bar in the
'locked' position and drain the air tanks. Close air tank
drain cocks when air has exhausted from the air tanks.
3. If required, to remove the front pressure converter,
open the hood to gain access.
4. Remove electrical wire from contact assembly (17) on
hydraulic cylinder body (21) of pressure converter.
5. Remove breather hose assembly from port 'B' of
hydraulic cylinder body (21).
6. Remove air supply line from port 'A' of air cylinder
body (1).
7. Remove hydraulic line from port 'D'.
8. Using a suitable container to catch brake fluid,
remove brake fluid reservoir line from port 'C' of
hydraulic cylinder body (21).
9. Remove mounting hardware securing pressure
converter to its mounting on the machine. Remove
pressure converter assembly to a clean work area for
'Disassembly'.
DISASSEMBLY
Numbers in parentheses refer to Figs. 1 and 2.
Note: When it is necessary to clamp the pressure
converter in a vice or equivalent mechanism, do not
clamp on air cylinder body (1) or on the cylindrical
portion of hydraulic cylinder body (21).
WARNING
Use care to prevent damaging seal grooves,
push rod and cylinder bores. Defects on these
surfaces will cause leakage. One mark could
mean loss of pressure and brake failure which
could cause personal injury and property
damage.
1. Using a suitable solvent, clean pressure converter
assembly thoroughly.
2. Drain hydraulic fluid from pressure converter into a
suitable container.
Courtesy of Machine.Market
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