3522.5-0000010 OM
325
7.3.2 Possible failures in hydraulic system for RLL and FLL control, guide-
lines for troubleshooting
Possible failures in hydraulic system for RLL and FLL control, guidelines for trouble-
shooting are shown in Table 7.3b.
Table 7.3b
Failure, external manifestations,
cause
Troubleshooting
LL hydraulic-system pressure loss (both RLL and FLL can not be lifted), pres-
sure loss is accompanied by extraneous noise and slaps
LL hydraulic-system pump collaps-
ing
Replace the pump
Hydraulic-system pressure loss, a loaded lift linkage (both RLL and FLL) can
not be lifted at all or can not be lifted in an uppermost position, extraneous noise is
not heard
Deadlock of the pressure limiting
valve (Р=24.5MPa) 1 (Figure
7.3.6)
To carry out the tests set the manometer with scale
of 25 MPa into the pressure tap hole “М3” (Figure
7.3.6) on the pump housing. Set the EHS distribu-
tion valve Section №1 into the “lift” position by the
joystick and measure pressure, which shall be
within the range from 20.5±0.5MPa. If the pressure
is lower, unscrew the valve 1 (Figure 7.3.6), rinse
the valve and its seat. Put the valve back in its
place, set the EHS distribution valve Section №1
into the “lift” position by the joystick and check the
pressure in point “М3”, which shall be 20.5±0.5
MPa.
Spontaneous lowering of RLL (lowering without a command received from
the instrument panel or remote control buttons)
Deadlock of the lowering valve of a
regulatory section ЕНR-23LS
Failure can be eliminated only by a dealer in a
service centre in the following manner:
- dismount the electro hydraulic section (EНR),
by unscrewing the nuts of the stud-bolts of the in-
tegral unit. During dismounting procedure pay at-
tention to integrity of the O-rings and the shuttle
valve (OR VALVE), both in the regulatory section
and in the distribution valve neighboring section;
- disassemble the lowering valve ЕНR-23LS and
rinse its components according to subsection 7.3.3
“Lowering valve of the section ЕНR-23LS disas-
sembly procedure”;
- put the electro hydraulic section (EНR) back in
its place
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