Page 13 of 36 Pages
Maintenance
The clutch and throttle sender bodies are made of 6061-T6 aluminum, which has been anodized. To clean them, a warm soapy
solution should be used. Do not attempt to use an abrasive compound as is done when shining brass.
Maintenance Schedule
Every 30 Days:
1. Check hydraulic fluid level (should be between 1/2 and 2/3 full on the sight glass).
2. Check system pressure (pressure should be between 70-90 psi), see note below concerning reservoir
pressure.
NOTE
The reservoir pressure will vary between 70-90 psi due to temperature changes. There is no reason to become
alarmed unless the pressure drops below 70 psi, then the system should be repressurized to 80+ psi. If the
pressure loss is over a relatively short period check for air leakage. Should the pressure loss from full pressure
to minimal operation pressure be over an extended time period just repressurize the system. This extended
pressure loss is normal and may be compared to the same type pressure loss one experiences with a good
set of automotive tires after an extended time.
Every 6 Months:
1. Check fluid level in the reservoir (level should be approximately 1/2 to 2/3 of sight glass).
2. Check system pressure, it should be between 70-90 psi. Consult the note above about system pressure
change.
3. The system is self-lubricating, but the ball-joints on control linkages should be oiled.
4. Check mounting bolts on the control slaves (clutch and throttle) to verify that vibration has not loosened
them.
5. Check lock nuts on control linkages; verify that they are tight.
6. Check fitting connections for any leakage.
7. Where tubing runs are exposed and are bordering heavy traffic areas, check for damage and repair as
required.
When working on engine and operating the
engine throttle arm by hand, disconnect
throttle linkage from the control slave. If
linkage is not disconnected the pilot check
valve will not allow a throttle retardation
unless a sender arm is actuated to de-
crease the throttle.
Clutch Senders
Forward Position — Forward Direction
Center Position — Neutral
Aft Position—Reverse Direction
NOTE
Prior to starting engines, both throttles and
clutches should be synchronized. This is
done by moving the sender’s control arm in
a complete cycle fore and aft, stop to stop.
This needs to be done at only one station.
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