Barko 350 SE Service Manual Download Page 49

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page 49

375 SE

800-00162

SERVICING THE BYPASS VALVE

SERVICING THE BYPASS VALVE
1. Unscrew the bypass valve from the housing.
2. Inspect the valve and mating seat for damage or foreign material. It is recommended that the o-ring and back up

ring be replaced.

3. Reinstall the bypass valve into the housing.
4. Torque to 7 to 10 ft. lbs. (9.5 to 13.6 Nm).

SERVICING THE CHARGE CHECK AND HIGH PRESSURE RELIEF VALVES

SERVICING THE CHARGE CHECK AND HIGH PRESSURE RELIEF VALVES
1. Remove the charge check and high pressure relief valve hex plug.
2. Remove the spring and check poppet or valve cartridge from the housing.
3. Inspect the valve and mating seat in the housing for damage or foreign material. It will be necessary to replace

the housing if the seat is damaged.

NOTE:

NOTE: Several designs of charge check and high pressure relief valves have been used. Do not attempt to mix

different vintage parts.

NOTE:

NOTE: The appropriate check valve kit and/or check and relief valve kit should be used when servicing all units

prior to date code 87-40.

NOTE:

NOTE: Always replace ball type charge check valves with the poppet type.
NOTE:

NOTE:

NOTE: The valve poppet or cartridge, spring, plug, and main housing were changed at date code 87-40, and are

not individually interchangeable with earlier design parts.

NOTE:

NOTE: If the pump housing must be replaced on a unit with date code 86-14 through 87-39, the latest design

charge check and high pressure relief valves must also be installed.

4. Reinstall the valve cartridge, spring, and plug (with o-ring) into the housing.
5. Torque the plug to 70 to 170 ft. lbs. (95 to 230 Nm).

CAUTION

The relief valves are factory set and should not be

The relief valves are factory set and should not be
tampered with except for replacing the entire cartridge.

tampered with except for replacing the entire cartridge.

tampered with except for replacing the entire cartridge.
Disassembly may change the setting and cause erratic

Disassembly may change the setting and cause erratic

Disassembly may change the setting and cause erratic
unit operation or premature failure.

unit operation or premature failure.

SERVICING THE CHARGE PRESSURE RELIEF VALVE

SERVICING THE CHARGE PRESSURE RELIEF VALVE
1. Remove charge relief valve hex plug.
2. Remove the spring and poppet from the housing. Do not alter the shims or interchange parts with another valve.
3. Inspect the poppet and mating seat in the end cap for damage or foreign material.
4. Reinstall the poppet, spring, and plug (with shims and o-ring) into the housing.
5. Torque the plug to 30 to 70 ft. lbs. (41 to 95 Nm).

SERVICING THE INTEGRAL CHARGE PUMP AND AUXILIARY PUMP MOUNTING PAD (VARIABLE PUMP)

SERVICING THE INTEGRAL CHARGE PUMP AND AUXILIARY PUMP MOUNTING PAD (VARIABLE PUMP)
NOTE:

NOTE:

NOTE: Variable pumps without an integral charge pump have no gerotor or drive parts installed in the charge

pump cavity. Procedures for removing and installing the charge pump cavity cover or auxiliary

mounting pad are similar to those for units with an integral charge pump.

1. If the unit is equipped with an auxiliary pump mounting pad, remove the two (2) hex head screws retaining

the flange cover or auxiliary pump.

2. Remove the flange cover or auxiliary pump and o-ring.
3. Using a 9/16" wrench, remove the three (3) hex head screws retaining the charge pump cover or adaptor to

the housing.

4. Remove the cover or adaptor.
5. Remove the temper load ring and discard. The temper load ring should always be replaced when the cover

or adaptor has been removed.

6. On earlier units, remove the o-ring, spacer plate, gerotor ring, and pin. On later units, remove the o-ring, gerotor cover,

and pin.

NOTE:

NOTE: The gerotor ring and spacer plate are incorporated into a one (1) piece gerotor cover on pumps built after

first quarter, 1986.

Note the orientation of the gerotor ring (or cover) and pin for reassembly.

MDT46 SWING PUMP MAINTENANCE CONTINUED...