Teagle Tomahawk C12, Instruction Book / Parts List

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6.6 Adjusting the pressure relief valve.
To check the relief valve setting place an in line pressure gauge in the supply hose to the valve. Remove both
hoses from the bed chain hydraulic motor and blank both hose ends. (3/8” BSP blanking plug for the hose fitting).
Start the tractor and operate the bed chain with the bed chain speed control in its mid position. The pressure
shown on the gauge should be 120 —170 bar. The pressure setting should remain the same throughout the
whole range of bed chain speed.
To adjust the bed chain pressure hold the allen bolt still while slackening the lock nut. To increase the bed chain
pressure setting, turn the grub screw clockwise until the desired setting is achieved. Retighten the locknut.
6.7 Pressurising valve maintenance.
To check the operation of the pressurizing valve. Unscrew the valve assembly from the outlet cap
and check the piston is free to reciprocate properly.
6.8 Leaks, seal replacement.
Remove the hoses and electrical connections from the valve. Remove the valve on its mounting plate from the
machine. Take the mounting plate off the valve and thoroughly clean the valve of dirt and debris before stripping
the valve.
To split the valve to replace interface seals undo the long studs through the valve and separate individual slices.
Replace the damaged seals and reassemble the valve. Fitting of O rings not obtained from manufacturer may
lead to repeated failures as specific high quality grade O rings are used to seal the valve.
The studs should be tightened to a torque of 13.5 Nm. (10 lb ft).
6.9 Specific torque settings.
Torque Setting (Nm) Torque Setting (lb ft)
Long studs through valve.
13.5 10
Closure plate socket head cap screws.
13.5 10
Manifold socket head cap screws. 20.3 15
Cartridge valve assemblies. 27.1 20
End cap unions (Inlet/Outlet) 1/2” BSP. 70-75 52-55
Slice port unions. 70-75 52-55
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