
4.9.3
HYDRAULIC TANK BREATHER ASSEMBLY
The Hydraulic Tanks Assembly contains a Breather Assembly with an Air Breather Filter
which requires no maintenance.
4.10
CONTROL CIRCUITS
After leaving the pressure filters, the hydraulic oil enters the control circuits, the
routine maintenance of which is limited to ensuring that the joints are kept tight and
hoses in good condition.
4.11
TO FIT NEW LEVELLING JACK CYLINDER
The hydraulic rams may in due course require attention such as the
replacement of the gland seal. In order to carry out maintenance, the rear
rams have to be removed from the jack housing. This can be done by
allowing the ram, together with the bottom section of the jack to drop
downwards into a hole or other suitable cavity immediately below the jack. To
carry this out, put the jack foot onto the ground then disconnect the two pipes
which pass through the side of the jack casing. There is a top cross pin which
locates the top of the ram and which passes through the jack casing; this can
be removed and by lifting the bottom section of the jack the ram can now be
worked upward sufficiently to enable a cross bar to be put through the ram
head.
The bottom section of the jack unit can now be disconnected by driving out
the cross pin which locates the ram rod at the bottom of the jack extension
tube. The ram can now be lifted from the housing for servicing (see
illustration of stabilising rams in spare parts listing).
4.12
PRESTART/SHUTDOWN CHECKS
The Daily Maintenance Checks as included in Table 4.3 should be performed
before starting the rig and after shutting down the rig. In addition:
•
Ensure that all control levers return freely to their rest positions after
use.
•
Ensure that the Holding Brake Safety Lock (Control A, Figure 3.3)
operates correctly in its rest position.
•
With the rig running and Holding Brake applied engage the Clutch to
ensure that the brake holds, and the drum does not rotate.
•
Check the operation of the Fine Feed Brake lever to ensure that it does
not bottom out or reach the end of its travel before the brake holds.
•
Check the overrun device is operational by lifting tooling on the main
hoist cable to activate the device.
Should any of the rig equipment be damaged it should be rectified or
replaced before use.
56
Summary of Contents for DUKE STAGE IV
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Page 47: ...FIGURE 3 14 12 Place the spreader bar between legs and pin Figure 3 15 FIGURE 3 15 41 ...
Page 49: ...2 Unpin and remove the stay bars Figure 3 18 Figure 3 19 FIGURE 3 18 FIGURE 3 19 43 ...
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Page 291: ...APPENDIX A ENGINE PERKINS 403D 15 285 ...
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Page 300: ...403D 15 IOPU Left side view 793 753 74 APPROX C OF G 179 APPROX C OF G 294 ...
Page 301: ...403D 15 IOPU Front view 296 457 208 354 295 ...
Page 303: ...403D 15 IOPU Rear view 255 6 234 5 250 241 7 274 24v OPTION 297 ...
Page 312: ... OOXVWUDWLRQ J RFDWLRQ RI ZDUQLQJ ODEHO 7DQG 7DQG 7 6 8 6DIHW 6HFWLRQ 6DIHW 0HVVDJHV 306 ...