HYDRAULIC SYSTEM (CONTINUED)
SYMPTOM
PROBLEM: REMEDY
SYSTEM OPERATES ERRATIC-
ALLY
Air in the system:
check suction side of system for leaks. Re-
pair leaks.
Cold oil:
allow ample warm-up time. Use proper weight oil
for operating temperature.
Dirty or damaged components:
clean or repair as needed.
Restriction in filters or lines:
clean and/or replace filter or
lines.
Not enough oil in system:
fill and check for leaks.
SYSTEM OPERATES SLOWLY
Oil viscosity too high, or “cold oil”.
Allow oil to warm up
before operating.
Low pump drive speed:
increase engine speed (check pump
owners manual for specifications).
Low oil level:
check reservoir and add oil as necessary.
Air in system:
check suction side for leaks. Repair leaks.
Badly worn pump, valves, cylinders, etc.:
repair or replace
faulty component(s) as necessary.
Restrictions in lines or filter:
clean and/or replace filter or
lines.
Improper adjustments:
check orifices, relief valves, etc.
Adjust as necessary.
Oil leaks:
tighten fittings. Replace seals, gaskets and dam-
aged lines.
SYSTEM OPERATES TOO FAST
Wrong size or incorrectly adjusted restrictor:
replace or
adjust as necessary.
Engine running too fast:
reduce engine speed.
OVER HEATING OF
OIL IN SYSTEM
Oil passing through relief valve for excessive time:
return
control valve to neutral when not in use.
Incorrect, low, dirty oil:
use recommended oil. Fill reservoir
with clean oil. Replace filter.
Engine running too fast:
reduce engine speed.
Excessive component internal leakage:
repair or replace
component as necessary.
Restriction in filters or lines:
clean and/or replace filter or
lines.
Insufficient heat radiation:
clean dirt and mud from
reservoir and components.
Malfunctioning component:
repair or replace.
Excess oil going to dock level circuit:
adjust flow divider for
2.5 to 3.1 GPM flow.
5-7
Summary of Contents for 317B
Page 3: ...MODELS 317B 318 319 TRAILER OPERATOR S MANUAL PURCHASED FROM DATE ADDRESS PHONE NO SERIAL NO...
Page 8: ......
Page 14: ...3 2 Figure 3 1 Front Trailer Terminology Figure 3 2 Rear Trailer Terminology...
Page 18: ...3 6 Figure 3 4 Hydraulic Controls...
Page 24: ...3 12 Figure 3 5 Steps for Loading and Unloading...
Page 30: ...3 18 Figure 3 10 Dock Leveler Operation...
Page 34: ...3 22 Figure 3 12 Front Extension Bulkhead...
Page 36: ...3 24 Figure 3 13 Rear Impact Guard and Antilock Brake System...
Page 40: ...4 2 Figure 4 1 Lubrication Points...
Page 45: ...4 7 Figure 4 2 317B 318 319 Wiring Diagram...
Page 46: ...4 8 Figure 4 3 Remote Wiring Diagram...
Page 52: ...4 14 Figure 4 6 Checking Axle Alignment CURBSIDE DRIVER SIDE Figure 4 7 Examples of Camber...
Page 56: ...4 18 Figure 4 10 Axle and Brake Assembly...
Page 62: ...4 24 Figure 4 13 Inboard Mount Hub and Drum Figure 4 14 Three Spoke Wheel and Drum...
Page 66: ...4 28 Figure 4 18 Mounting Tires and Wheels Figure 4 19 Stud Tightening Sequence...
Page 69: ...4 31 Figure 4 20 Dock Leveler Leg Assembly...
Page 80: ...5 10 NOTES...
