14 - 8
Checking Motor Leakage Rate
If the motor speed is low and the pump output is normal, the
cause could be excessive internal wear in the motor which
would result in high leakage of oil into the motor casing. By
measuring the amount of oil leaking from the motor casing
back to tank, it is possible to determine if the motor is worn.
1
Stop the engine.
2
Remove the seat and floorplate to expose the motors.
3
Disconnect the motor drain hose
A
. Connect a hose to
the drain adapter on the motor and insert the end of the
hose into a 6 litres (minimum) measuring jug or
container. Blank the open hose
A
.
4
On machines from serial no. 678000 a motor flush line
B
is connected to the motor casing which must be
disconnected and plugged before proceeding otherwise a
true leakage reading cannot be obtained.
5
Install a 0 - 400 bar (0 - 6000 lb/in
2
, 0 - 422 kg/cm
2
)
pressure gauge into the appropriate point on the pump to
measure the pressure generated in the motor feed line
(see next page for pressure test points).
6
Start the engine and, with the parking brake ON, operate
the motor service. Measure the amount of oil expelled
from the motor during one minute’s operation and
compare with the figures shown in the table below.
Note:
If the parking brake will not hold the machine
sufficiently to achieve the necessary line pressure, the
machine should be driven against a solid, immovable object
as shown at
C
.
If the flow rate is higher than normal, the motor should be
dismantled for repair as the distributor seals are probably
worn.
Section E
Hydraulics
9803/8500
Section E
14 - 8
Issue 1
Problem Solving
Illustration shows typical machine installation.
A
A
A
A
B
B
w
Average motor leakage rate
Pressure - bar (lbf/in
2
)
20 (290)
50 (725)
100 (1450)
150 (2175)
200 (2900)
300 (4350)
400 (5800)
Servo - l/min (UK gal/min)
2.2 (0.48)
2.3 (0.50)
2.4 (0.53)
2.8 (0.62)
3.0 (0.66)
3.7 (0.81)
4.0 (0.88)
US gal/min
0.58
0.60
0.64
0.74
0.79
0.97
1.06
Manual - l/min (UK gal/min)
3.3 (0.73)
3.4 (0.75)
3.5 (0.77)
3.9 (0.86)
4.1 (0.90)
4.8 (1.06)
5.1 (1.12)
US gal/min
0.88
0.90
0.92
1.03
1.08
1.27
1.35
C
325430
325400
Summary of Contents for ROBOT 150
Page 2: ......
Page 21: ...5 2 Safety Decals cont d Section 2 Care and Safety 9803 8500 Section 2 5 2 Issue 2...
Page 77: ...Attachments Section A Section A 7 7 9803 8500 Issue 1 Backhoe...
Page 97: ...4 3 Section C Electrics 9803 8500 Section C 4 3 Issue 1 Alternator S213570...
Page 123: ...1 1 Section D Controls 9803 8500 Section D 1 1 Issue 1 Safety Restraint Bar S168160 1...
Page 125: ...2 1 Section D Controls 9803 8500 Section D 2 1 Issue 1 Throttle Controls S168150D...
Page 142: ...Hydraulics 9803 8500 Issue 1 4 1 4 1 Descriptions Section E Section E...
Page 145: ...Hydraulics 9803 8500 Issue 2 5 2 5 2 Descriptions Section E Section E...
Page 146: ...Hydraulics 9803 8500 Issue 2 5 3 5 3 Descriptions Section E Section E...
Page 149: ...Hydraulics 9803 8500 Issue 2 5 6 5 6 Descriptions Section E Section E...
Page 152: ...Hydraulics 9803 8500 Issue 1 5 9 5 9 Descriptions Section E Section E...
Page 163: ...10 1 Section E Hydraulics 9803 8500 Section E 10 1 Issue 1 Pumps 168150...
Page 165: ...10 3 Section E Hydraulics 9803 8500 Section E 10 3 Issue 1 Pumps 168030...
Page 167: ...10 5 Section E Hydraulics 9803 8500 Section E 10 5 Issue 1 Pumps 168160...
Page 175: ...11 1 Section E Hydraulics 9803 8500 Section E 11 1 Issue 2 Pumps 167750...
Page 179: ...13 1 Section E Hydraulics 9803 8500 Section E 13 1 Issue 1 Drive Motors 167720 S167720A...
Page 183: ...13 5 Section E Hydraulics 9803 8500 Section E 13 5 Issue 1 Drive Motors S243720 X X S243870...
Page 212: ...18 1 Section E Hydraulics 9803 8500 Section E 18 1 Issue 2 Valves S204980 X X 3 B A 4 2 1 5...
Page 215: ...20 1 Section E Hydraulics 9803 8500 Section E 20 1 Issue 1 Servo Joysticks S167960...
Page 217: ...20 3 Section E Hydraulics 9803 8500 Section E 20 3 Issue 1 Servo Joysticks 167950...
Page 221: ...23 3 Section E Hydraulics 9803 8500 Section E 23 3 Issue 1 Rams S167800...
Page 241: ...1 2 Section F Transmission 9803 8500 Section F 1 2 Issue 2 Tyres and Wheels 167861 167811...
Page 243: ...1 4 Section F Transmission 9803 8500 Section F 1 4 Issue 2 Tyres and Wheels 167851...
Page 253: ...2 1 Section K Engine 9803 8500 Section K 2 1 Issue 1 Removal and Replacement S167990...