Maintenance BPU 2440/2950 Repair
wc_tx000328gb.fm 28
4.11 Bleeding the Control Circuit
See graphic: wc_gr001435
Recommended Tools:
Allen wrench – 6 mm
Socket or box wrench – 7 mm, 22 mm
Bleed control circuit whenever handle or exciter have been opened for
service.
4.11.1 Turn off engine before servicing.
4.11.2 Lock handle in its vertical upright position.
4.11.3 Remove belt guard to expose exciter pulley (a).
4.11.4 Secure the control lever in the reverse position using a C-clamp to
prevent the spring and piston inside from popping out when control
assembly is removed. Remove control assembly from handle tube.
4.11.5 Fill handle tube with oil.
4.11.6 Remove bleeder screw (c) from cover flange on exciter.
4.11.7 Slowly rotate exciter pulley counterclockwise (same direction as
normal operation) two full turns. Oil will flow out of bleeder hole during
this procedure as the piston in the exciter extends and retracts inside
flange cover.
4.11.8 Rotate exciter pulley to a position where oil is observed flowing from
the hole and insert the bleed screw while holding the pulley in this
position. This prevents air from being drawn back into the flange cover.
Tighten the bleeder screw.
4.11.9 Top off oil in handle tube.
4.11.10 Make sure O-ring is in place between control assembly and tube flange
and re-install control lever assembly. Coat bolts with Loctite 242 or
equivalent and torque to 7 ft.lbs. (10 Nm).
4.11.11 Remove fill plug from control lever assembly and fill with oil to “OEL”
mark (b). Do not overfill.
4.11.12 Wait 30 seconds for oil to fill area under piston, then remove
C-clamp and re-install fill plug.
4.11.13 Start plate and check directional control.
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