Clutch Pack Assembly (1135-123) - BOMBARDIER Chalenger 604 Supplemental Maintenance Manual

2.3

Clutch Pack Assembly (1135-123)

2.3.1 Tools
Diagonal cutters
Needle nose pliers
7/64 inch Allen head wrench
3 mm Allen head wrench (see paragraph 4.1)
Retaining ring tool (see paragraph 4.2)
2.3.2 Removal
Remove four pivot pins (1135-232, see section 3.0) located at the two clutch cranks. Two of
these pins connect to (gold colored) links (1135-110); allow the links to hang free. The other
two pins connect to the (painted) actuator rods (1135-105-1 & -2), which go up to the thrust
levers; allow the actuator rods to hang free. See section 3.0 for removal of the pins.
Remove the six metric screws attaching the (1135-254 on the right, and 1135-255 on the left)
shaft flanges to the servo drive subassemblies on both sides, left and right – see paragraph
2.2.2. The shaft will not fall since it is supported by the stub shaft of the servo drive outputs.
Wire one end of the shaft to the support structure on one side of the shaft, to temporarily
support it while the servo drive subassembly (1135-102) on that side is removed. See section
2.2.2.
When the servo drive subassembly is removed from one side of the assembly, the shaft
together with the two clutches (the clutch pack assembly 1135-123) may be shifted over,
through the hole left by removal of the servo drive subassembly until it is free from the stub
shaft of the remaining servo drive subassembly. Maneuver the shaft until it can be removed
downward with the clutches mounted on it. Care should be taken to keep the two halves of
the shaft (which is split approximately at the middle; note that the two halves of the shaft may
be rotated independently) from separating. If they do separate, there are some small parts
that may be lost.
If the stub shaft of the servo drive subassembly that is still in place comes out of it, reinstall it.
2.3.3 Replacement
Replace a new unit by reversing the procedure above for removal, i.e. maneuver the new unit
in place, engaging the stub shaft; continue to support the assembly 1135-100 while installing
the bearing housing with bearing; tighten all screws, replace pivot pins with their retaining
rings and cotter pins; then safety wire the screws on the bearing housing.
Replace all retaining rings (MS16624-5018) and cotter pins (MS9245-01), which had been
removed, with new retaining rings and cotter pins.
2.3.4 Rigging
The above process will probably have a negligible effect on rigging. However, the rigging
must be checked after clutch pack replacement, and adjusted as required. Note that a
minimum of "cushion" should be employed at full power and at flight idle. Excessive cushion
will store a load in the clutches, resulting in a heavy force requirement to move the throttles
out of those positions.
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R-2830