(7) External linkage rod.
For photographic purposes the pump is shown
out of machine.
If adjustment of the axle minimum and maximum
displacement screws does not bring the pressures
within 1378 kPa (200 psi), then the pump and motor
efficiencies should be checked.
If one of the gauges shows 0 for that direction of travel,
the propel pump is not going on stroke or a mechanical
problem exists with that propel pump.
When the pressure difference between the four test
ports is less than 1378 kPa (200 psi), remove the
pressure gauges from the test ports.
Thermal Bypass Valve Operational Test
Install a flow meter in the outlet line of the oil cooler. When oil
temperature is above 71C (160°F) the flow should increase
approximately 4 gpm while the machine is moving. The total
flow should be a minimum of 10 gpm to a maximum of 13 gpm.