Hardi NAVIGATOR 3000, Руководство оператора, Страница: 103 / 122

7 - Fault finding
101
Pump
Hydraulic System, Z-version
÷
NOTE! See the “Fault Finding” chapter of the “Boom Operator’s Manual” for more information.
Emergency operation - Liquid system
In case of power failure it is possible to operate all functions of the operating unit manually. First disconnect the multi plug
from the control box. Now manually turn the emergency control knobs.
The problem may be due to a blown fuse. A fuse is placed inside the box. Fuse type: Thermo
FAULT PROBABLE CAUSE CONTROL/REMEDY
Liquid leaks from the bottom of the pump. Damaged diaphragm. Replace diaphragm. See maintenance section.
Grease leaks from the bottom of the pump. Grease used has too low viscosity. Change to recommended grease type.
Grease leaks from the shaft grease seals. Grease used has too low viscosity. Change to recommended grease type.
Bearings worn/too high friction. Replace pump bearings and grease seals.
Lack of pressure. Pump valves are clogged or defective. Check for obstructions or, if needed, replace valves.
Clogged filters in fluid system. Clean all filters.
Vibrations in system and unpleasant noise from the
pump. Pump valves are clogged or defective. Check for obstructions or, if needed, replace valves.
Air is being sucked into system. Check for leaks, pinholes in suction hoses, tightness/
gaskets/O-rings of all fittings on the suction side.
Lack of flow/capacity. Internal wear on connecting rod and ring. Poor greasing. Replace parts as needed and observe
proper grease quality and intervals.
Pump valves are clogged or defective Check for obstructions or, if needed, replace valves.
Extreme internal erosion on diaphragm covers and
housing. Too high vacuum caused by clogged suction filter or
excessive pump speed (r.p.m.). Replace affected pump parts.
Clean suction filter and observe maximum pump
speed (r.p.m.).
Lack of internal cleaning. Use recommended cleaning procedures and add
extra cleaning agents (e.g. AllClearExtra or similar).
Lack of conservation of the fluid system during
storage. Always use a proper mixture of anti-freeze during
storage.
Short lifetime for diaphragm. Over speeding of the pump Observe maximum pump speed (r.p.m.).
FAULT PROBABLE CAUSE CONTROL/REMEDY
ParaLift™ lock does not lock.
Boom lift raises to max. position, when tractor
hydraulics are engaged.
Back pressure in return line exceeds 220 psi (15 bar). Connect the return line with a free flow to hydraulic oil
reservoir.
Divide return line in two and lead return oil back to
reservoir via two spool valves.
Oil heats up in Closed Center systems. Bypass valve does not close properly. Check / close (screw in) by-pass valve.
Internal leaks in flow regulator. Replace flow regulator O-rings and backup rings.
Replace flow regulator.
Individual hydraulic piston does not move. Clogged restrictor. Dismantle and clean restrictor.