Pump Removal/Replacement - MTD 2010 Shop Manual

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Pump removal/replacement

Figure 2.10
O-ring boss
O-ring face
3/4" wrench
Figure 2.11
Figure 2.12
Hose clamp
15/16" wrench
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To remove the pump:
1. Place a suitable container, large enough to hold all of
the fluid in the reservoir under the pump.
NOTE: On models with a vertical shaft engine, remove the
engine by following the procedures described in
the vertical shaft engine section of this chapter.
2. Loosen the hose clamp that secures the suction hose
to the pump. See Figure 2.10.
3. Remove the suction hose and drain the fluid into the
container that was placed under the pump.
NOTE: The suction hose is steel reinforced. Trying to
clamp off the hose can result in damage to the
hose.
4. Remove the high pressure hose from the pump using
a 3/4" wrench and a 15/16" wrench.
See Figure 2.11.
NOTE: The elbow fitting on the discharge side of the pump
has an O-ring boss on the side that goes into the
pump. When installing the fitting, loosely thread it
in until it is in the correct alignment. Then tighten
the jam nut to compress the O-ring, providing the
seal. See Figure 2.11. Inset.
NOTE: The side of the elbow fitting that the high pressure
hose connects to has an O-ring face. Inspect the
O-ring, part number #721-04411, before installing
the hose on re-assembly. A damaged O-ring can
cause fluid to leak out and/or air to be sucked into
the system.
5. Remove the three coupling support bracket nuts
using a 1/2" wrench. See Figure 2.12.
6. Slide the pump and the coupling support bracket off
as one assembly.
Engine and pump
9