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8.5 One function suddenly fails in one direction of operation only (either permanently on or off).
Possible causes
a) Switch/joystick in control box has failed.
b) Electric circuit to coil has failed.
c) Damage to circuit board
d) Coil failed.
e) Pilot orifice blocked
f) Pilot Cartridge Stuck
Solution
a) Check switch/joystick is working, contact Teagle Machinery Ltd if repair is necessary
b) Check multipin connector at back of control box, replace damaged pin(s).
c) Check circuit board for burnt out circuits caused by short circuit. Replace if damaged.
d) Check coil is working and replace if faulty. (Section 9.1)
e) Clean pilot orifice (see section 9.5)
f) Remove cartridge (item 7 Section 10.1) and check spool moves freely within cartridge. Replace
cartridge if unable to get it moving freely again.
8.6 Bed chain no longer operates or operates erratically with poor speed control. Failure may be sudden
or intermittent.
Possible causes
a) Bed directional function has failed
b) Failure of the proportional cartridge coil
c) Malfunction of the proportional cartridge
d) Failure of the speed control circuit
e) Motor failure
f) Dirt or contamination in the proportional cartridge preventing its movement
g) Dirt or contamination in the Bypass Valve in the flow control slice does not allow it to close resulting in
the oil dumping to tank starving any oil flow to the motor.
h) Dirt or contamination in the Pressure Relief Valve in the flow control slice does not allow it to close
resulting in the oil dumping to tank starving any oil flow to the motor.
i) Dirt or contamination in the Pressurising Valve in the outlet cap does not allow it to close resulting in
the oil dumping to tank starving any oil flow to the motor.
Solution
a) Diagnose as per Section 8.5 above
b) Check coil for correct operation. (Section 9.1)
c) Apply 12V directly to proportional coil,
1. If bed runs at full speed the cartridge is operating correctly, refer to Section 9.3 for electrical
diagnostics
2. If no change is detected, the cartridge may be mechanically jammed by contamination, refer to
Section 9.2 for removal and repair of cartridge.
d) Check circuit for correct operation. (Section 9.3)
e) Attach hoses directly to motor, replace if faulty.
f) Remove proportional cartridge and clean, replace if damaged in any way. (Section 9.2)
g) Remove bypass valve from the flow control slice, inspect for contamination, clean and replace.
(Section 9.6)
h) Remove pressure relief valve from the flow control slice, inspect for contamination, clean and replace.
(Section 9.6)
i) Remove pressurising valve from the outlet cap from the end of the valve chest, inspect for
contamination, clean and replace. (Section 9.8)
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