Broderson IC-20-1K, Руководство по эксплуатации и обслуживанию, Страница: 55 / 65

3-19
IC-20 PISTON PUMP TROUBLESHOOTING
TROUBLE CAUSES REMEDIES
1. System will A. Brake switch tripped Release brake switch.
not operate B. Oil supply low Check oil level, fill.
in either C. Oil filter clogged Replace filter element.
direction. D. Oil too heavy Use proper viscosity oil.
E. Bypass valve open Close bypass valve.
F. Neutral solenoid valve is open Repair valve or circuit.
G. Brake solenoid valve is open Repair valve or circuit.
H. Low charge pressure--below 200
PSI
See below.
I. Charge pump relief valve
damaged
Remove relief valve parts. Examine parts and seat.
Replace damaged parts.
J. Damaged internal charge check
valve
Disassemble and determine if check valve is faulty.
K. Charge pump key sheared Inspect charge pump for damage & replace key.
L. Charge pump worn or scored or
damaged
Remove parts and examine. Replace defective parts.
If severe scoring is indicated, remove complete pump
unit, disassemble and inspect for damage.*
M. Drive coupling broken Inspect coupling for sheared spline.
N. Forward or reverse relief valve
stuck open
Remove relief valve. Clean or replace.
2. Pump is noisy. A. Air in system Fill oil reservoir. Check and fix suction line leaks.
B. Clogged filter Replace filter element.
C. Internal pump or motor wear or
damage
Disassemble, inspect and repair.*
3. Sluggish A. Air in system See Steps 1-B, 1-D, 2-A.
response to B. Low charge pressure See Step 1-H.
acceleration C. Loose bypass valve Close bypass valve.
or deceleration. D. Park brake on Repair park brake or brake solenoid.
E. Relief valve dirty or damaged Remove, clean or replace.
F. Internal pump or motor wear or
damage
Disassemble, inspect and repair.*
* Pump should be disassembled only by experienced hydraulic pump repair personnel,
preferably at a Sundstrand Service Center.