JLG G6-42P Service Manual - Manual (Page 332)

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Section 4
Assembly and Installation
5. Install springs into bores in inner piston.
Figure 4.55. For brake with 12 springs, jump one
bore each three. Figure 4.55.
6. Install compression plate on piston. Correctly
align the fastener holes. Use marks on piston and
lock pin slot. Figure 4.56.
7. Apply pressure to the compression plate until it is
flat against the piston.
Figure 4.55
Figure 4.56
COMPRESSION
PLATE
PISTON
MARKS
2. Lubricate internal brake housing surfaces, inner
and outer piston surfaces and oil seal bores with
SAE 90 oil. Figure 4.53.
NOTE
Each piston assembly has three different sizes of
oil seals: three large, one medium, one small.
3. Install medium oil seal into inner piston bore and
install the small oil seal into the outer piston bore.
Figure 4.53.
4. ONLY use a manual press to install inner piston
into outer piston. Be careful not to damage oil
seals. Do not force the inner piston assembly.
Figure 4.54.
NOTE
Rotate pistons until marks are aligned. If inner
piston does not rotate easily, disassemble it and
find the cause. Figure 4.54.
Figure 4.53
Figure 4.54
PRESS
MARKS
INNER
PISTON
OUTER
PISTON
LARGE
OIL
SEAL
OIL
SAE 90
MEDIUM
OIL SEAL
SMALL
OIL SEAL