7
Note: There are two types of control valve orifices:
Shallow Orifice Pocket
.058 in.
Stake in 3 Places
Control Valve
Deep Orifice Pocket
.180 in.
Control Valve
6 Place a new control valve gasket on the motor.
7 Connect the feedback linkage and position the control
valve on the motor.
Important: When the control valve is positioned on the
motor make sure the feedback linkage points towards
the motor’s end cover.
8 Install the six hex head bolts and tighten them finger
tight.
9 Move the control lever back and forth; it should move
freely in both directions and self-center. If it doesn’t
recheck the feedback linkage.
10 Tighten the six hex head bolts to 16 lb-ft [22 Nm].
The plate orifice is used in control valves that have a
shallow orifice pockets.
The orifice size is stamped on the orifice in thousandths
of an inch, example: 57 = .057 in.
Install the plate orifice so the orifice size is visible. Stake
it in three places with a center punch. Insure that the
orifice is properly seated after staking.
The plug is used in control valves that have a deep
orifice pockets.
Before installing the plug orifice be sure that the o-ring is
in place. Apply petroleum jelly to the edge of the plug
orifice and o-ring.
Carefully insert the plug orifice into the orifice pocket;
The large opening in the plug must go into the control
valve.
This section describes the removal, inspection, and installation of the control valve.
1 Clean the control valve and the area around where it attaches to the motor.
Important: Cleanliness is extremely important; be sure that no contamination gets into the motor.
2 Remove the six hex head bolts that hold the control valve to the motor.
3 Lift the control valve away from the motor and disengage the feedback linkage, see figure 2.
4 Remove the control valve gasket.
5 Inspect the control valve: Start by thoroughly flushing the control valve with clean solvent. Then blow it dry with
compressed air. Be sure to blow through all of the control valve’s internal passages.
Inspect the control valve linkage. Move the control lever back and forth; it should move freely without binding. There
should be no free play in the feedback link or control lever.
Check the control valve orifice; if it is plugged after flushing replace it.
6 Place a new control valve gasket on the motor.
Minor Repair: Control Valve Inspection
Summary of Contents for 1 Series
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