Loader Bobcat 773. Manual - part 17

HYDRAULIC CYLINDERS (Cont’d)

Disassembly (Cont’d)

Remove the piston seal from the piston [A].

Remove the O–ring from the piston [B].

Wash the cylinder parts in solvent and air dry them.

While servicing the cylinder do not damage the parts.
Inspect for nicks, scratches or otherwise damaged or
bent parts before assembling the cylinder. Replace parts
that appear damaged in any way. The cylinder may not
function correctly if there is damage to any of the parts.

Destroy all the O–rings and seals and replace them with
NEW O–rings and seals.

Assembly

Install the O–ring on the piston [C].

NOTE: Do not overstretch the seal.

Install the seal on the tool and stretch it until it fits the
piston [D].

Allow the O–ring to stretch for 30 seconds before
removing it from the tool.

A

B–03689

C

B–12812

D

B–12809

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773 BICS Loader

Service Manual

B

B–03703

HYDRAULIC CYLINDERS (Cont’d)

Assembly (Cont’d)

Install the seal on the piston [A].

Use a ring compressor to compress the seal to the correct
size [B].

Leave the piston in the ring compressor for three minutes.

Install the oil seal on the rod seal tool [C].

NOTE: The O–ring side of the oil seal goes toward

the inside of the cylinder.

Install the oil seal in the head [D].

A

B–12813

C

B–03702

D

B–03671

773 BICS Loader

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Service Manual

B

B–12811

HYDRAULIC CYLINDERS (Cont’d)

Assembly (Cont’d)

Install the wiper seal with the lip toward the outside of the
head [A].

Install the back–up washer on the head [B] & [C].

Install the O–ring next to the back–up ring [D].

A

B–03682

C

B–07200

D

B–07007

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773 BICS Loader

Service Manual

B

B–07008

HYDRAULIC CYLINDERS (Cont’d)

Assembly (Cont’d)

If a seal was removed from the head use the following
procedure to install a new one.

NOTE: Do not overstretch the seal.

Install the seal on the tool and stretch it until it fits the
piston [A].

Allow the O–ring to stretch for 30 seconds before
removing it from the tool.

NOTE: Do not turn (roll) the seal as you install it.

Damage to the seal may result.

Use a ring compressor to compress the seal to the correct
size [B]. Leave the tool over the seal for five minutes.

Install the head on the rod [C].

Install the piston on the rod [D].

A

B–12809

C

B–07011

D

B–07198

773 BICS Loader

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Service Manual

B

B–14305