KB21 Service Manual Pub 09-14
61
Cylinder Control Systems
40-A. Bucher L.8S Manual Control/Cable
Mechanical Control Valve
Note: The standard L.8S remote cable control valve is equipped with cable actuated controls for the
control valve. The hydraulics are operated manually through the movement in cables. It must be
determined if a problem is in cable controls, therefore all cable control components should be checked
before the valve.
IMPORTANT
1. Safety is the most important beginning of test. You must be totally in control of tractor and you’re
surrounding area before beginning any test. There must not be other people in area when tractor is
started and mower is being tested. If you have an assistant always know where you’re assistant is
before you do anything. Only you should be able to start tractor, keep the key with you, do not leave
it in tractor.
2. Repairing a failed component is not always repairing the cause of a failure, when making repairs
always
check all associated components because one component can be the cause of another component
failure.
Information collection any information on unit from operator will be helpful.
1. What is model unit, size, type head, type tractor it is mounted on etc?
2. What is not working correctly? In as much detail as possible.
3. Has this malfunction existed for some time, just start suddenly, continuous malfunction or off and on,
when does malfunctions occur.
or
any changes to any components have been made to unit recently. (Repairs - Maintenance - Accidents
- Operator change)
5. Have all the obvious items been checked, oil levels (tractor & unit reservoirs), electrical supply (dead
battery, loose connections, etc.)
6. Does the malfunction affect all circuits, one, two or more?
7. Does malfunction affect both sides of the same function or just one (example lift & lower, in or out,
etc)
8. Does malfunction happen when cold or hot, only cold or only hot, more when cold than hot, more
when hot than cold etc.
9. What conditions? What is unit doing when malfunction occurs, running at low rpm, high rpm, heavy
cutting, light cutting, level ground, slope angle etc.
10. Any information that will help determine what may be causing the malfunction or to pin point the
location of the malfunction.
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