Operation and maintenance manual

Section 230-0000
SM 1407 Rev 2 11-01
3
Body System - Body System Schematic
BODY SYSTEM DIAGNOSIS
CONDITION REASON REMEDY
Body raise time too slow, Worn pump. Pump output should Repair or replace pump.
should be 16 sec, loaded. be as specified in Section 000-0000,
Hydraulic oil pressure too GENERAL INFORMATION.
Pump cavitation Check oil level in hydraulic tank. Refer to
Section 230-0040, HYDRAULIC TANK.
Check for suction leak at pump inlet port.
Check for obstruction in hydraulic lines.
Check anti-cavitation plug on suction line
for tightness
Dirt or foreign particles lodged Replace relief valve assembly. Refer to
between relief valve control Section 230-0060, BODY CONTROL
poppet and seat VALVE.
Relief valve worn Check relief valve setting, as described in
Section 230-0060, BODY CONTROL
VALVE. Replace relief valve assembly if
worn.
Control valve spool not stroking Check spool travel, as described in Section
completely 230-0060, BODY CONTROL VALVE.
Body cylinder binding or Repair or replace body cylinder.
obstruction in oil passage
Incorrect pilot pressure from the Check pilot pressure. Replace valve if
pilot control valve necessary (non-servicable item).
Body lower time too slow, Return oil from body cylinders is Check hydraulic lines for restrictions.
should be 12 sec in 'Power being restricted in hydraulic lines
Down' or body control valve
Incorrect pilot pressure from the Check pilot pressure. Replace valve if
pilot control valve necessary (non-servicable item).
Body will not hold Oil bypassing between control Replace body control valve assembly.
spool and control valve body
Control spool not centred Repair body control valve.
Oil bypassing body cylinder seals Repair body cylinders.
Body will not raise or lower Pump failure Repair or replace pump.
Relief valve pressure too low Check and adjust relief valve setting, as
described in Section 230-0060, BODY
CONTROL VALVE.
Electrical failure at joystick or body Check and replace joystick and/or control
control valve solenoids solenoids.
low, should be 172 bar
(2 500 lbf/in²).
Check control valve spool for correct 'Float'
position. Refer to Section 230-0060, BODY
CONTROL VALVE.
Check pump driveshaft.