S0708470K
Page 8
Steering and Brake Pump (Denison T67DB Series)
SERVICE AND MAINTENANCE
CIRCUIT INSPECTION
NOTE:
Periodic inspection of hydraulic fluid condition and tube or pipe line connections can save
time consuming breakdowns and unnecessary and expensive repairs.
1. All hydraulic connections must be kept tight. A loose connection in a pressure line will permit fluid to
leak out. If hydraulic oil level becomes so low as to uncover inlet pipe opening in reservoir, extensive
damage to pump can result. In suction or return lines, loose connections permit air to be drawn into
system, resulting in noisy and/or erratic operation.
2. Clean hydraulic oil is the best insurance for long service life. Therefore, the reservoir should be
checked periodically for dirt and other contaminants. If hydraulic oil becomes contaminated, the
system should be drained and reservoir thoroughly cleaned before adding new oil.
3. Filter elements should be checked and replaced at regular service intervals. A clogged filter element
results in a higher pressure drop. This can force particles through the filter which would ordinarily be
trapped, or can cause the by-pass to open, resulting in a partial or complete loss of filtration.
4. Air bubbles in the reservoir can cause damage to pump and other components. If bubbles are seen,
locate source of air and seal the leak.
5. A pump which is running excessively hot or noisy is a potential failure. Should a pump become noisy
or overheated, immediately shut down the machine and correct problem.
ADDING HYDRAULIC OIL TO SYSTEM
1. When hydraulic oil is added to replenish the system, it should be poured through a clean wire screen
(200 mesh or finer), or preferably pumped through a 10 micron (absolute) filter.
2. It is important that hydraulic oil be clean and free of any substance which could cause improper
operation or wear pumps and other hydraulic components. Therefore, use of cloth to strain hydraulic
oil should be avoided to prevent lint from entering system.
ADJUSTMENTS
1. No periodic adjustments are required, other than to maintain proper shaft alignment with driving
medium.
LUBRICATION
1. Internal lubrication is provided by the hydraulic oil in the system. Coat shaft splines with a dry
lubricant (Molycoat or equivalent) to prevent wear.
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