DCE80-100E
Technical Handbook
Hydraulpump
Service
30
P.Group 70
TDCE01
04GB
Hydraulic pumps of gear type
General instructions are given below for service operations that
should be carried out on the pumps and how much wear is ac-
ceptable on the various components before a particular compo-
nent must be replaced.
1. If different sections of the pump must be prised apart, take
great care not to damage any of the machined surfaces. The
use of excessive force may damage the parts.
2. It is essential that all parts are blown clean and wiped with a
lint-free linen cloth before being assembled.
3. If the parts are difficult to fit during assembly, tap with a soft
mallet - never use a steel hammer.
4. The gears are carefully matched, and they must therefore be
kept together as a unit during dismantling. Treat them with
extreme care, so that the shafts and the teeth are not dam-
aged. Avoid touching the shaft ends.
5. Never hammer a plain bearing or roller bearing into place.
Use a press or other suitable tool.
6. Before assembly, fill all ports with hydraulic fluid, so that the
pump is thoroughly lubricated from the start. All pumps must
turn in the intended direction of rotation, since the pressure
will otherwise damage the seals.
7. Hot fluid must not be allowed into a cold pump, since it may
otherwise seize.
8. After starting, run the pump without load and with the engine
running at idling speed for at least two minutes. During this
running-in period, check that the pump does not run hot.
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