STINAR PS-813B/E - Troubleshooting

Passenger Stairway PS-813B/E Boeing | 27
SECTION 2 - SERVICING PASSENGER STAIRWAY
Table 2.2.1 | Troubleshooting
TROUBLE PROBABLE CAUSE REMEDY
Mechanical
Unit will not move
easily
Wheel bearing frozen Repack or replace.
Unit will not turn
Caster pivot needs
lubrication
Grease.
Caster pivot frozen Replace caster.
A-frame will not
extend or retract
A-frame tubes binding
Check for foreign
objects or bent tubes.
Engine will not
crank
Battery discharged
Check batteries and
recharge if needed.
Electrical problem
See electrical
troubleshooting.
Engine cranks but
will not start
Throttle or choke
requires adjustment
Refer to Engine
owner’s manual
Other engine
problems
Various
Refer to Engine
owner’s manual
Hydraulic System (see Figure 2.2.1.1)
Stairway or A-frame
will not raise
Fluid in hydraulic
reservoir low
Fill to proper level
with specied uid
Leakage in hydraulic lines
or ttings
Inspect lines and
ttings, tighten or
replace as necessary
Pressure relief set too low
Adjust pressure relief
per Section 3
Control valve defect Repair or replace.
Hydraulic pump problem Repair or replace
Stairway or A-frame
raises too slowly
Low oil level in hydraulic
tank
Add oil
Relief valve set too low Adjust per Section 3
Internal control valve leak Repair or replace
Internal stairway cylinder
leak
Repair cylinder. See
Figure 4.3.8
Internal A-frame cylinder
leak
Repair cylinder
2.2
TROUBLESHOOTING