jcb Robot 160 - Checking Wheel Speed

Section E - Hydraulics
Fault Finding
Hydrostatic Transmission
E - 35 E - 35
9803-9450-2
Checking Wheel Speed
The pump output and general efficiency of the drive
system may be checked by raising the machine off the
ground and checking the wheel speeds.
!MWARNING
The start-up procedure requires the machine to be
disabled (wheels raised off the ground, work function
disconnected, etc.) while the procedure is carried out.
HYD-8-1
Place the machine safely on blocks, so that all four wheels
are clear of the ground. Ensure that the machine is stable.
Stick a piece of reflective tape on a wheel rim. Start the
engine and run at maximum speed then operate the drive
control. Using a stroboscopic meter, measure the speed of
wheel rotation in each direction which should be 81-85 rev/
min.
Check the speed of the wheels on the opposite side of the
machine.
Note that excessive wheel speed may result in cooling
problems due to overheating of the hydraulic oil.
Maximum Displacement Adjustment
If necessary the appropriate adjusting screws should be
screwed in 1/4 turn at a time until the correct wheel speed
is achieved. Stop the engine while adjustment is carried
out.
1 Remove the seat and floorplate to expose the pump.
2 Slacken the locknut on the appropriate adjuster and
adjust as follows K
Fig 28. ( T E-36):
If the left hand wheels are rotating too fast, screw in
adjusters A (forward) or B (reverse) to achieve the
correct speed. If the right hand wheels are rotating too
fast, screw in adjusters C (forward) or D (reverse).
Retighten the appropriate locknut.
If all four wheels rotate slowly and cannot be corrected by
adjustment, the most likely cause would be internal wear
of the hydrostatic pump.
If the wheel speed is slow on one side only, the cause
could be a faulty servo or a faulty motor. Carry out
procedure on Checking for Faulty Pump or Motor
(X E-33) to determine which is faulty.
Following this procedure, further small adjustments may
be required to achieve correct straight line travel
K
Machine Veers to One Side when
Travelling ( T E-37).