HPD-T and HPD-HV Hydraulic Sign Post Drivers
Greenlee / A Textron Company
15
4455 Boeing Dr. • Rockford, IL 61109-2988 USA • 815-397-7070
Maintenance (cont’d)
1. Check that the oil inlet of the accumulator is
depressurized.
2. Remove the protective cap over the charging
screw (9) of the accumulator. The socket head
screw must be perfectly clean.
3. Loosen the charging screw on top of the accumu-
lator (maximum of two turns). Totally neutralize the
pressure before dismounting the accumulator.
4. Unscrew the accumulator cover (10), take out the
diaphragm (11), and check for leakage and
damage.
5. Clean, check, and replace damaged or worn parts.
6. Grease the seal faces of the accumulator body
(12) and the accumulator cover (10) with silicone.
7. Spray both sides of the diaphragm with silicone.
Place the diaphragm with its bead pointing down-
ward so that it fits in the groove of the accumulator
body (12).
8. Unscrew the charging screw and replace the seal
ring (13).
9. Grease the thread of the accumulator cover (10)
with copper grease and tighten to approximately
200 Nm (148 ft-lb).
10. Fasten the charging screw lightly, and loosen it
two turns afterward.
11. Mount the filling device on the filling socket of the
accumulator cover and fasten it lightly while
turning the handle (2) forward and backward,
ensuring that the hexagon resiliently fits into the
charging screw.
12. Close the bleeder valve (5) by turning it clockwise.
13. Connect the hose (7) to the check valve (6).
14. Connect the free end of the hose directly to the
nitrogen bottle by using the reducing nipple.
Note: Use only pure nitrogen.
15. Read the pressure on the gauge (4). Carefully
open the valve of the nitrogen bottle (1) and
charge with nitrogen until the pressure is approxi-
mately 20% higher than required charging pres-
sure. Close the valve of the nitrogen bottle.
16. If the gauge (4) shows too high a nitrogen pres-
sure, loosen the bleeder valve (5) until the re-
quired pressure is achieved.
N
2
1
8
7
3
4
9
13
10
11
12
6
5
2
(1) Valve of nitrogen bottle
(2) Handle
(3) Filling adaptor
(4) Gauge
(5) Bleeder valve
(6) Check valve
(7) Hose, approximately
3 m (10 ft)
(8) Reducing nipple
(24.32-14WFG)
50027182
Accumulator filling device
(includes items 2–8)
50027174
Accumulator kit (fully charged)
(includes items 9–14)
Accumulator is charged with nitrogen under high
pressure. This pressure must be unloaded before
dismounting.
Failure to observe this warning could result in
severe injury or death.
Accumulator Recharging Procedure
17. Close the charging screw (9) of the accumulator
by turning the handle (2) clockwise.
18. Unload the nitrogen hose by opening the bleeder
valve (5).
19. Dismount the filling device and check the charging
screw (9) for leakage with drops of oil.
20. Fit the protective cap over the accumulator.
(9) Charging screw
(10) Accumulator
cover
(11) Diaphragm
(12) Accumulator
body
(13) Seal ring
(14) Protective cap
(not shown)
