Revision B
Revised 5/20/2003 12:33 PM
52
Operating Instructions BMS-270LPII
Hydraulic System
10.10 Suction Filters
Item 10 (P002454) on Service Drawing 700-SD0010 is an in-tank 40 micron suction filter.
See drawing number 700-0121 for the location of filters and strainers. This filter is used to
filter debris from hydraulic tank to the charge pump and ultimately to the closed loop circuit.
This filter must be maintained or it will cause severe damage to the piston pumps. The gauge
on top of the 90 deg elbow coming out of the tank is an indicator of the filter condition. See
drawing number 700-0121 for the location of the pressure gauge. The gauge should be
checked at the beginning of each workday and the filter replaced if indicated by the reading
on the gauge. The drive motor should be running at 3500 rpm when the gauge is checked. If
this gauge reads above 5 inHg of vacuum pressure replace the filter as soon as possible. The
multiscraper can operate at a maximum of 10 inHg on this gauge. If the gauge reads above
10 inHg, the suction pressure has increased to the point where the pump can no longer supply
the piston pump with enough fluid.
Operating Instructions BMS-270LPII
CAUITON: Insufficient fluid flows from the charge pump filters will cause
sever damage to the piston pumps.
