Service Manual

Major Repair
General
The procedures on the following pages are for the
complete disassembly and reassembly (Major Repair) of
the BDP-1 0L variable pump.
Again, cleanliness is a primary means of assuring satis-
factory hydraulic unit life on either new or repaired units.
Cleaning parts by using a clean solvent wash and air
drying is usually adequate.
As with any precision equip-
ment,
all parts must be kept free of foreign materials and
chemicals. Protect all exposed sealing surfaces and
open cavities from damage and foreign material.
During reassembly of the pump all surfaces which have
relative motion between two parts must be coated with a
filmofclean
oil or a lubricant such as petroleum jelly. This
will assure that these surfaces will be lubricated during
start-up.
It is recommended that all O-rings and gaskets be re-
placed. Lightly lubricate all O-rings with clean petroleum
jelly prior to assembly.
All gasket sealing surfaces must
be cleaned prior to installing new gaskets.
Disassembly Procedures for Variable
Pump
Prior to performing Major Repairs on the pump, remove
the external components
as described in the 'Minor
Repair" section of this manual. These include the follow-
ing:
Bypass valve
Charge Check
Valves
Charge Pump
Lay the unit on its
side. Using a 6 mm internal hexwrench,
remove the four
(4) screws which retain the end cap to
the pump housing.
The internal springs should separate the end cap from
the housing. Remove the end cap from the housing.
Remove End Cap from Housing
emove Gasket and Aligning Pins
Remove the gasket and
two (2) alignment pins from the
housing.
Remove the pump cylinder block
kit from the pump shaft.
Remove the pump cylinder blockspring and washerfrom
the pump shaft.
Page 10 BDP Service Manual