OPERATOR'S MANUAL MAINTENANCE

Section E - Hydraulics
Fault Finding
Fault Finding Tests
E-246 E-246
9803/9880-3
Fault Finding Tests
Slow or Underpowered:
– boom up operation
– bucket service operation
– dipper service operation
– slew service operation
Carry out the following tests:
Harsh Operation When Selecting:
– boom down
– slew service
Carry out the following tests:
Tracking Off Line
Carry out following tests:
Additional information
Measure the amount of deviation over a 20 metre (165.6 ft)
distance and record ground conditions.
Deviation limit = 1m (39.4 in) deviation in 20m (165.6 ft) of
travel
If machine is fitted with priority valve in pump line (this
valve usually feeds low flow / weedcutter circuit) try
connecting the two main service hoses together that are
connected to the valve. Does this change the fault?
Swap the two main hoses on the hydraulic pump. Does the
problem change direction?
Poor Tractive Effort
Carry out the following tests:
Additional Information
What travel gear is the machine operating in when the
problem occurs?
Loss of Creep Speed
Carry out the following tests:
Additional information
When creep speed tracking is selected is `tortoise' symbol
displayed on monitor? yes / no
Test 001 Testing negative control signal
Test 002 Testing max flow cut signal
Test 003 Testing main pump pressures
Test 004 Testing horsepower control
Test 005 Testing operation of main hydraulic spool
Test 006 Testing operation of pressure switches
Test 007 Testing engine speed settings
Test 008 Testing machine cycle times
Test 016 Testing Pump Flow
Test 001 Testing negative control signal (Boom
down only)
Test 011 Testing operation of Slew brake (Slew only)
Test 006 Testing operation of pressure switches
Test 001 Testing negative control signal
Test 003 Testing main pump pressures
Test 012 Testing track motor relief valve settings
Test 013 Testing track motor drain line rates
Test 008 Testing track motor speeds
Test 001 Testing negative control signal
Test 003 Testing main pump pressures
Test 012 Testing track motor relief valve settings
Test 013 Testing track motor drain line rates
Test 012 Testing max flow cut signal
Test 008 Testing track motor speeds
Test 006 Testing pressure switches