V. System Noisy.
A. Air in System.
1. Low oil level in reservoir.
2. Suction line between reservoir and charge pump,
including suction filter, leaking at some point and allowing
air to be drawn into system. A good indication of air in the
system is a considerable amount of foam in the reservoir.
3. End of return line within the reservoir not submerged in
B. Hose or Tubing Not Properly Insulated.
1. Make sure hose or tubing is not touching any metal
that can act as a sounding board for the neutral hydraulic
2. Insulate hose and tubing clamps with rubber to absorb
A. Air in System.
1. See Step V-A.
B. Control Orifice Plug Partially Blocked.
1. Remove the bolts that hold the control housing in place
and check the orifice. If this is clean, remove the charge
pump and blow air through the passage between the
charge pump and control.
C. Internal Wear or Damage.
1. See Step I-H.
Oil Leak at Shaft End.
1. Replace seal. See instructions for "Pump" -
See instructions for "Motor" -
TRANSMISSION REPAIR PROCEDURE
REPLACEMENT OF MOTOR
Should it become necessary to perform repairs to the
REPLACEMENT OF CHARGE PUMP
transmission during the warranty period, certain parts,
REPLACEMENT OF CHECK VALVES
components or kits may be replaced without effecting or
REPLACEMENT OF MANIFOLD
violating the Sundstrand warranty.
HIGH PRESSURE RELIEF VALVES
Repairs beyond those outlined under Field Repair will
violate the warranty, therefore, it is recommended that
the transmission be returned to the Sundstrand factory
REPLACEMENT OF MOTOR OR
or an Authorized Sundstrand Service Station for repair
PUMP FRONT SEAL
The proper replacement procedures for the above
components are outlined on the following pages.
The following parts, components or kits may be replaced
When working on all hydraulic equipment, cleanliness is
or repaired in the field without affecting or violating the
very important. Before removing any of the above
Sundstrand Transmission Warranty:
components, clean the immediate area to prevent dirt
1 REPLACEMENT OF MAIN PUMP
from entering the transmission.