Technical Service Manual M9 Transfer Stretcher (M999-29, Version 11, June 2021) 13
6. MAINTENANCE & SERVICING
b) Electric controls
• Check that all of the buttons on the handset work correctly.
• Check that the lock out feature is functional on all handset button functions.
c) Electrical system
• Unplug the stretcher from the mains supply. Check all electric cables for cracks, cuts or damage from
crushing.
• Unplug the stretcher from the mains supply. Check that the potential equalisation terminal (POAG terminal)
is functional by measuring the resistance between the earth pin on the 3 pin plug and the potential
equalisation terminal. Check the resistance between the earth pin on the 3 pin plug and any other earth
cable on the stretcher (green and yellow cable). The resistance in all instances must be less than 0.20.
• Unplug the stretcher from the mains supply. Press any control button to check that the battery will power the
stretcher adjustments. It may be necessary to plug the power cord into the mains supply for up to one hour
prior to this test to ensure the battery is charged.
• Adjust the backrest, legraise, deck height and deck tilt. Check that there are no abnormal noises during each
functions full range of movement.
d) Backrest quick-release mechanism
• Adjust the backrest fully up. Move the CPR knob to the emergency position. Check that the backrest lowers
when force is applied to it. Check that the CPR knob automatically returns to the normal position when it is
released.
e) Bed ends
• Check that the bed end can be removed and reinstalled. If jamming occurs clean the bed end sockets and
bed end pegs and add a small amount of Vaseline (petroleum jelly) or food grade grease to the sockets.
f) Fold Down Handles
• Check that both handles lock in the upright position.
• Check that both handles fold down fully into recess and can be freely lifted again.
g) Castors
• Set the castor pedal in the brake position. Check that all four castors cannot swivel or roll.
• Set the castor pedal in the neutral position. Check that all four castors are free to swivel and roll.
• Set the castor pedal in the steer position. Check that the steer castor locks in line with the length of the
stretcher and cannot swivel. Check that the remaining castors can swivel.
h) 5th Wheel
• Check engagement of 5th wheel when in locked position.
• Check that the gas strut is energised and has no oil leaks.
i) Mechanical items
• Check that all bolts, screws, nuts and pivot-pins are securely fastened.
• Check both siderails. Raise siderail and check gas strut assists raising. Check siderail does not lower
unassisted. Check that the siderail latch automatically latches with the siderail in the raised position – this can
be seen visually and heard audibly. Lift the siderail latch and lower the siderail to see that it is in good working
order.
• Check that the power cord storage hook is not twisted or damaged.
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