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757 MAINTENANCE MANUAL
F. System Test for the Power Transfer Unit
S 865-158
(1)
Make sure the manual lever/position indicator on the PTU control valve is in the CLOSED position.
S 865-159
(2)
Pressurize the right hydraulic system with a hydraulic service cart to 3000 psi with 30 gpm capacity (AMM 29-11-00/201).
S 865-160
(3)
Open this circuit breaker on the P11 panel:
(a) 11D31, HYDRAULICS PTU CONT
S 495-299
(4) In the electrical systems card file, P50, do this step:
(a) Place the toggle switch on the end of the right engine speed card (M10311) in the test mode position or install a jumper between a ground and the test point J1 on the end of the right engine speed card (M10311).
NOTE: Depending on the model of the speed card being
____ used, the new cards have the toggle switch, older cards have a test point. Either the toggle switch or the jumper provides a signal that the right engine is in operation. You must do the step which follows no more than three seconds after the above step. If you do not do this, the POWER XFER UNIT message will show on EICAS.
S 865-162
(5) Close this circuit breaker on the P11 panel:
(a) 11D31, HYDRAULICS PTU CONT
S 215-163
(6) Make sure you can hear the operation of the PTU in the left main wheelwell.
NOTE: After the PTU starts, it will stop and then continue
____ to operate at a slower speed and a lesser sound level.
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757
MAINTENANCE MANUAL
(7) S 215-164Make sure the POWER XFER UNIT message is not shown on EICAS.
(8) S 215-165Make sure the pressure indication for the left hydraulic system on EICAS is not less than 2600 psi.
(9) S 865-166Make sure the manual lever/position indicator on the PTU control valve is in the OPEN position.
S 865-167
(10) Open this circuit breaker on the P11 panel and attach a DO-NOT-CLOSE tag:
(a) 11D31, HYDRAULICS PTU CONT
S 865-168
(11)
Operate the hydraulic service cart to reduce the pressure in the right hydraulic system to zero.
S 035-169
(12)
Disconnect the electrical connector from the PTU control valve.
S 495-300
(13)
In the electrical systems card file, P50, do these steps:
(a) Return the toggle switch on the end of the right engine speed card (M10311) to the normal position or remove the jumper from the ground and test point J1 on the end of the right engine speed card (M10311).
NOTE: Depending on the model of the speed card being
____ used, the new cards have the toggle switch , older cards have a test point.This removes the signal that the right engine is in operation.
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