Repairing Hydraulic Parts; Dismantling The Head-Valve Units - IP 71VHT Serie Manual De Reparación

Secure the PTO side flange to the casing, taking care with the
lip seal as described previously and tighten the fixing screws
to the recommended torque.
Then feed the flange on the indicator side without shims in
the carter and start to move it closer, manually screwing the
M6x40 service screws in equally, with small rotations such as
to move the cover in slowly and correctly.
At the same time, check that the shaft rotates freely by turning
it manually.
Continuing the procedure in this way, a sudden increase in
hardness during shaft rotation will soon be experienced.
At this point, halt the forward movement of the cover and
loosen the fixing screws completely.
With the aid of a feeler gauge, measure the clearance between
the side cover and pump casing (see Fig. 14).
Proceed to determine the shim pack, using the table below:
Detected Measurement
From: 0.05 to: 0.10
From: 0.11 to: 0.20
From: 0.21 to: 0.30
From: 0.31 to: 0.35
From: 0.36 to: 0.45
From: 0.46 to: 0.55
From: 0.56 to: 0.60
From: 0.61 to: 0.70
Fig. 14
No. of
Shim Type
pieces
/ /
0.1 1
0.1 2
0.25 1
0.35 1
0.35 1
0.10 1
0.25 2
0.35 1
0.25 1
Fig. 15
18
Once the type and number of shims have been determined
using the table, check the following: assemble the shim pack
on the indicator side cover centering (Fig. 15), secure the cover
to the casing, following the procedure in par. 2.1.2, and tighten
the screws to their recommended torque.
Check that the shaft rotation stall torque is between 4 Nm and
6 Nm.
If this torque is correct, connect the con-rods to the bend
shaft and to the next stages. If it is not, redefine the shim pack,
repeating the operations.
2.2

REPAIRING HYDRAULIC PARTS

2.2.1 Dismantling the head‑valve units
Operations are limited to inspection or replacement of valves,
if necessary.
Proceed as follows to extract the valve units:
- Unscrew the 7 M10x25 valve cover fixing screws and
remove the covers (Fig. 16).
- Remove the valve plugs by means of an extractor hammer
(code 26019400, Fig. 16).
- Remove the valve units using pliers (Fig. 16/a).
If the suction and outlet valve seats remain
stuck on the head (for example because of
incrustations due to prolonged lack of use of the
pump), proceed as follows:
- use the extractor hammer used for the valve
plugs (code 26019400 combined with the tool
code 27513700), as shown in Fig. 16/b.
Fig. 16
Fig. 16/a