MAINTENANCE OF FORKLIFTS - OD1660 - LESSON 1/TASK 1
required. All high pressure hoses are constructed with a wire braid.
Hose size, in sixteenths of an inch, is indicated by a dash on the
hose or fittings.
For example, a -12 on the hose or fittings
indicates 12/16 or 3/4 of an inch.
(2) Hydraulic Hose Repair.
(a) To repair a damaged hydraulic hose (figure 11 on the
following page), place the hose securely in a vise, with the damaged
and extending past the vise jaws (view A). With a hacksaw, cut and
remove the damaged portion of the hose.
(b) Cut the hose around its circumference, the length of the
fitting, down to the wire braid (view B). Do not cut the wire braid.
(c) With the hacksaw, cut the hose diagonally from the end of
the hose (view C). Strip the hose down to the top of the wire braid,
using a pair of pliers.
(d) Place the fitting into the vise securely.
Screw the hose
into the fitting up to the shoulder (view D).
(e) Reposition the hose and the fitting in the vise so that the
end is up (view E).
Lubricate the end of the connection with
hydraulic oil. Place the small tapered end of the connector into the
opening of the hose and fitting. Screw it into the hose until it is
tight against the fitting (view F).
(f) This repair operation can be accomplished with process
tools and equipment located on the Tool Outfit, Hydraulic Systems
Test and Repair Trailer or as stated in TM 9-4940-468-14.
(3) Positioning of Hoses.
Ensure that the hoses on the tilt
cylinder, extension cylinder, and lift cylinder, are positioned in
such a manner that the hose will not chafe or be cut during the
operation of the unit.
. The brake assembly on the rough terrain forklift
is of the
hydraulically operated, 360 segmented, shoe type, actuated by an expander