OPERATOR'S MANUAL MAINTENANCE

Section E - Hydraulics
Hydraulic Pump/Regulator
Hydraulic Pump Dismantling and Assembly
E-80 E-80
9803/9880-3
Hydraulic Pump Dismantling and Assembly
The working environment must be clean and the
workbench covered with a cloth or rubber sheet to prevent
damage to the components.
The illustration shows both halves of the double axial
piston pump. The regulators and the gear pump are not
shown.
K Fig 14. ( T E-85)
Note: 1 The components from one pump section must not
be mixed up with the corresponding components from the
other section and should be returned to the section from
which they came.
The item numbers called up in the following procedures
correspond with those in the exploded view.
Dismantling
Before dismantling, the pump ports should be plugged and
the external surfaces thoroughly cleaned to prevent the
ingress of dirt into the pump mechanism.
1 Remove from pump casing 1 the breather plug 2 and
drain plug 3. Drain the oil into a suitable receptacle.
2 As an aid to re-assembly, match mark the mating
flanges of the regulators and pump casing 1. Remove
the mounting screws and lift off the regulators. Put to
one side.
Fig 4.
3 Remove the gear pump from pump casing 1.
4 Remove booster cover 4, booster 5 and cover 6.
5 Remove socket head screws 7, 8, 9 to release valve
cover 10.
Fig 5.
6 Position the pump assembly on the bench with the
regulator mounting flanges uppermost. Fit lifting eyes
to the top of valve cover 10 and use a crane to
support the weight of the unit
K
Fig 6. ( T E-81).
7 There are two tight fitting locating pins 10A between
pump casing 1 and valve cover 10. To separate the
two units gently tap the valve cover with a plastic
hammer, all the while making sure that it remains at
right angles to drive shaft 11 and driven shaft 12. At
the same time take care not to damage the mounting
flanges of the two units.
As the two units actually separate, avoid dropping
valve plates 13, 14, check-valve sub-assemblies 15,
16, 17, O-rings 18, 19, 20 and flange seal 21.
A370940
10
9
4
5
6
8
7
A370950