B&M 70225 HI PERF SERVO User Manual
Page 2
ing ring (13).
STEP 2. Remove Servo Cover
and O-ring seal (14). The only
way to remove the servo cover
easily is to first work the cover out
until the o-ring is visible through
the two slots in the case. Hook
the o-ring with a small screw-
driver, then remove the o-ring by
breaking it and pulling it from the
cover. The cover can then be
removed.
STEP 3. Remove the servo pin
retaining ring (18), washer (19),
and apply pin spring (20).
STEP 4. Remove the 2nd apply
piston pin (29).
STEP 5. Remove the retaining
ring (28).
STEP 6. Remove the cushion
spring retainer (27) and cushion
spring (26).
INSPECT
STEP 7. Inspect springs for dis-
tortion and replace as necessary.
IMPORTANT: Check servo
bores (A) in the case for any
wear or sharp edges which may
cut the servo seals (see fig. 1).
ASSEMBLY
STEP 8. (Refer to figs 1 and 2 for
assembly) Install cushion spring
(26) into the B&M High Perfor-
mance 2-4 Servo Piston (25),
cushion spring retainer (27) on
top of the cusion spring.
STEP 9. Compress spring re-
tainer just past the retaining ring
groove in the B&M High Perfor-
mance 2-4 Servo Piston (25) and
install the retaining ring (28).
STEP 10. Install the B&M High
Performance 2-4 Servo Piston
(25) on the 2-4 servo apply pin
(29) with spring (20), washer (19)
and retaining E-ring (18) on the
2-4 servo apply pin (29).
FIGURE 2. Servo Disassembly / Assembly
FIGURE 3. B&M High Performance 2-4 Servo (Parts)
22 B&M High Performance 2-4 Servo Housing
13
2ND APPLY PISTON
ASSEMBLY
14
SEAL, O-RING (2-4 SERVO
COVER) [B&M replacement
dark green or black]
15
COVER, 2-4 SERVO
16
PISTON, 4TH APPLY
17
RING, OIL SEAL (4TH
APPLY PISTON)
18
E-RING, RETAINING (SERVO
APPLY PIN)
19
WASHER, SERVO APPLY
PIN
20
SPRING, SERVO APPLY PIN
21
SEAL, O-RING (INNER
PISTON HOUSING) [B&M re-
placement red]
22
HOUSING, SERVO PISTON
INNER [B&M High Perfor-
mance 2-4 Servo]
23
RING, OIL SEAL INNER (2ND
APPLY PISTON) [B&M re-
placement black, scarf,
small]
24
RING, OIL SEAL OUTER
(2ND APPLY PISTON) [B&M
replacement black, scarf,
large]
25
PISTON, 2ND APPLY [B&M
High Performance 2-4
Servo]
26
SPRING, SERVO CUSHION
27
RETAINER, SERVO
CUSHION SPRING
28
RING, RETAINING (CUSION
SPRING RETAINER)
29
PIN, SERVO APPLY
30
SEAL, SERVO APPLY PIN
31
SPRING, SERVO RETURN
25 B&M High Performance 2-4 Servo Piston
14 O-ring (2-4 servo cover)
seal (dark green or black)
21 O-ring (inner piston housing)
seal (red)
24 Ring, oil seal inner (2nd apply piston)
(black, scarf, large)
23 Ring, oil seal inner (2nd apply piston)
(black, scarf, small)