MKT V-22/HP-380T4, Operating, Maintenance And Parts Manual, Page: 19 / 73

VII. MAINTENANCE AND SERVICE INSTRUCTIONS
A. The V-22 hammer and the HP-380T4 hydraulic power unit should be
inspected regularly to help keep it in good operating condition. The time
interval between necessary adjustments and repairs depends primarily on
how much and how hard the machine has been used. Repair or replace
broken or damaged parts as soon as they are discovered. Periodic cleaning
and repainting will help keep all parts in better working order and prolong the
machine's life.
B. Maintenance procedures for the diesel engine in the
HP-380T4 are described in the engine manufacturer's manual.
C. Proper maintenance of the total V-22/HP-380T4 system begins with
cleanliness; assuring that no dirt or foreign material enters the hydraulic fluid
circuit. Contamination of the components of the hydraulic system - pumps,
motors, valves, etc., will result in erratic operation, down time, shortened
equipment life, damaged parts and expensive repair or replacement costs.
To trap foreign material which might inadvertently enter the hydraulic circuit,
the V-22/HP-380T4 system contains several filters and strainers. The spin-
on type charge filter element located on the side of the main hydraulic pump
should be changed after the initial fifty (50) hours of driving time or after the
hydraulic fluid has been changed. During normal operation, this filter
element should be changed at least two (2) times per year or after every 200
hours of driving time.
The main hydraulic filter, located just within the HP-380T4 bulkhead, filters
the hydraulic oil in the closed-loop system before it re-enters the main
hydraulic pump. This filter element should also be changed on the intervals
given for the charge filter element mentioned above. The main filter also has
a visual indicator which will show if the filter is clogged and in a bypass
condition. If the hydraulic oil is bypassing this filter a red band will be visible
under the transparent dome of the indicator.
The hydraulic oil in the reservoir passes through a suction strainer before it
enters either of the pumps. These strainers should be cleaned whenever the
hydraulic tank is serviced.
D. The hydraulic fluid in the system should be maintained at all times. Leaks in
the hydraulic system, particularly noticeable after transport and set up of this
system, should be eliminated by checking and retightening the leaking parts.
Hose connections may leak as a result of manipulating and straightening the
lines and should be promptly tightened.
THE CAUSE OF HYDRAULIC
LEAKS WHICH CANNOT BE CORRECTED SHOULD BE ELIMINATED BY
CALLING FOR FACTORY AUTHORIZED DISTRIBUTOR SERVICE
ASSISTANCE.
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