TM 9-3418-20-14&P
MAINTENANCE
Before shipment each machine is given a serial number and is individually checked and tested by an inspector. A
record of the construction and data on the tests are kept on file. Whenever reference is made to the machine, the serial
number should be stated.
This number is stamped on the left front ram way of the column. Do not confuse this number with Model numbers
which may be found stamped on pump or valves.
Except for regular lubrication and checking the level of the hydraulic oil the machine requires little maintenance.
However, a little time spent in keeping it clean and free from dirt and chips will be well repaid by the service it will give.
Clean the machine by wiping and brushing. Do not use compressed air as it only tends to force dirt and grit into the
working parts.
Each piece used in the construction is carefully made and passes a rigid inspection before being built into the
machine. After assembly each machine is adjusted and tested by actual cutting. It therefore merits care and
consideration if it is to maintain the accuracy and long life which are built into it.
The oil in the main hydraulic system should be changed after each 2400 hours of service. After the old oil has
been removed, the oil reservoir should be carefully cleaned to insure that no sludge, metal dust, nor chips remain. The
procedure in refilling is then as explained in the paragraph FILLING OIL RESERVOIR.
After long service, wear will take place on sliding surfaces. To compensate for such wear gibs are provided which
may be adjusted or scraped to the original working clearances.
The gib for the vertical slide of the tool head has an adjusting screw at the top and at the bottom. To adjust the gib
loosen the bottom screw slightly and tighten the top one.
The gib is tapered and care must be taken to see that it is not drawn down far enough to cause it to bind. The gib
holding the ram in place has capscrews to hold it down and setscrews in the side of the column to adjust it up to the ram.
To adjust the gib loosen the capscrews and turn each of the setscrews inward slightly. Tighten the capscrews last and see
that the gib does not bind. If the gib is too tight it will cause the ram to have a jumpy motion when running at low speeds.
The gibs for holding the cross rail against the column are flat plates and when worn, must be resurfaced and
scraped to the correct fit. To hold the cross rail against sidewise motion on the column a tapered gib is placed between
the rail and column on the inside edge of the left vertical way of the column. To adjust this gib loosen the jam nut on the
lower side of the gib head and tighten the upper one.
LUBRICATION
The ways of the ram and column are lubricated under pressure from the main hydraulic system and should require
no attention. The oil passes through a filter before going to the ways. This filter can not be cleaned and therefore should
be replaced after each 1200 hours of service. The filter used is Purolator Type P-/2.
The flow of oil to the ways is regulated by two needle valves placed in the lubricating lines near the filter. Both filter
and needle valves are plainly visible when the square door is removed from the left side of the column.
Other points requiring lubrication are equipped with oil or grease fittings. Lubrication Chart A-HD-36 shows the
locations of such fittings, the type of lubricant required, and the frequency of lubrication.
38