Lull 944E-42 Service Manual - Manual (Page 44)

General Information, Specifications and Maintenance
2.28 Model 644E-42/944E-42 Rev. 6/04
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: 1-262-656-5200
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.
2.9 HOSES AND TUBES
2.9.1 Hose and Tube Inspection
1. Damaged, dented, crushed, or leaking hose and
tube fittings restrict oil flow and the operation of the
system being served. Fittings showing signs of
movement from their original position 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 indicates the need to replace the hose
assembly. If in doubt, replace the hose.
3. Replace 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 and verify that the hose takes up the designed
position before tightening the connection completely.
Tighten clamps sufficiently to hold the hose without
crushing it, and to prevent movement and chafing.
2. If a hose is replaced on a moving part, move the part
through its entire range of motion to verify that the
hose will not incur damage. Adjust as necessary.
3. When installing any hose, verify that it does not
become kinked or twisted.
4. NEVER allow freely moving or unsupported hoses to
contact each other or a related work surface. Such
contact causes chafing and reduces hose life.