SkyTrak 8042 Service Manual - Manual (Page 58)

2.33 Model 8042, 10042, 10054 Legacy Rev. 10/03
General Information and Specifications
2.8 REPLACEMENT
ALWAYS use the correct tool when removing or replacing
any part or performing any service.
Some procedures may require the use of specialized
tools. If needed, many of these tools can be obtained
through Snap-On
®
tool distributors.
Contact:
Snap-On Incorporated
P.O. Box 1410
Kenosha, WI 53141-1410 USA
Phone: (262)-656-5200
Internet: http://www.snapon.com
Snap-On ® is a registered trademark of Snap-On
Technologies, Inc.
Replace o-rings, seals and gaskets whenever they are
disturbed. NEVER mix new and old seals or o-rings,
regardless of apparent visual condition. ALWAYS
lubricate new seals and o-rings with hydraulic oil before
installation.
ALWAYS replace elastic locknuts with new elastic
locknuts to help ensure proper fastening.
ALWAYS refer to the Parts Manual for proper
replacement of appropriate size, type and grade of ALL
fasteners.
2.9 HOSES AND TUBES
2.9.1 Hose and Tube Inspection
1. Damaged, dented, crushed or leaking hoses, tubes
or fittings restrict oil flow and operation of the system
being served. Fittings that show any signs of
movement from their original positions have failed
and must be replaced. ALWAYS replace the entire
hose or tube assembly if the fittings are damaged.
2. Hoses must remain in good condition. Obvious signs
of external hose wear, or hydraulic fluid leaking or
weeping indicate the need to replace the hose
assembly. If in doubt, replace the hose.
3. Replace a hose or tube assembly if any of the
following conditions exist:
• Ballooning (replace hose immediately!)
• Kinking, crushing, stretching or deforming
• Concealed corrosion of wire reinforcement
• Chafed outer cover
2.9.2 Hose and Tube Installation
1. When installing a new hose, loosely connect each
end to verify that the hose takes up the designed
position, and is free of twists and unnecessary
bends before tightening completely. Tighten any
support clamps sufficiently in order to hold the hose
in position without crushing it, preventing movement
and chafing of the hose.
2. If a hose is replaced on a part that moves, move the
part through its entire range of motion to verify that
the hose will not make contact with any component.
Adjust the hose as necessary.
3. When installing any hose, be sure that the hose
does not become kinked or twisted.
4. NEVER allow free-moving or unsupported hoses to
contact each other or any other components. Such
contact causes chafing and reduces hose life.
2.10 BEARINGS
2.10.1 Bearing Removal
1. NEVER remove bearings unless absolutely
necessary! ALWAYS use the recommended size
and type of bearing puller to reduce the risk of
damage to the bearing or related components.
2. When bearings or bushings are removed, verify that
the bearing or bushing is free of discoloration, nicks,
scuffing or signs of overheating. If in doubt, replace
the bearing or bushing.
2.10.2 Bearing Cleaning
ALWAYS wear safety glasses. Clean the bearings that
are acceptable for service in a suitable solvent. NEVER
spin-dry a bearing with compressed air; this can cause
metal-to-metal contact and damage the bearing.
Compressed air can also cause a bearing to come apart.
After cleaning a bearing, immerse the bearing in clean
lubricating oil until needed.