Troubleshooting
|
Symptom |
Likely cause |
Action |
|---|---|---|
|
Rod will not extend |
no power / wrong rotation / low oil / relief bypassing |
check supply, rotation, level, relief |
|
Extends too slow |
wrong voltage/freq, cold oil, pump wear, load > rated |
verify nameplate & load; warm oil; test pump |
|
Rod will not hold |
hydraulic lock failed / valve spool stuck / seal bypass |
overhaul valve block / replace seals |
|
Rod chatters / knocks |
air in system, relief hunt, end-cushion missing |
bleed; check relief; verify stroke ends |
|
Oil leak at rod |
worn wiper/rod seal |
replace seal kit; inspect rod |
|
Motor trips / overheats |
phase loss, over-cycle, relief stuck at pressure |
check supply & duty; relief test |
|
S-angle (upward) unit weeps from top |
breather blocked, thermal expansion |
clear/replace breather, check fill level |
Safety & Boundaries
DYTP2550-S/90 is a general-purpose actuator, not a certified safety brake. For personnel-below vertical loads, furnace doors, or hazardous-zone use, order the safety/Ex option and have it reviewed locally.
For gas or dust explosive atmospheres: only the declared Ex motor + Ex junction version is permitted. A standard IP65 unit is not explosion-protected.
Never weld on the cylinder, valve block or rod. Never drill or tap the pressure envelope.
Never adjust the relief valve in the field to "get more thrust" - you climb past the 25.5 kN rating and risk cylinder, rod and bracket.
Isolate electrical and hydraulic (block both chambers) before any seal work.
Maintenance Schedule
|
Interval |
Check / Service |
Replacement trigger (see §8) |
|---|---|---|
|
Every shift |
rod position hold, oil weep, abnormal noise, end-knock |
any uncontrolled drift → stop |
|
Weekly |
rod surface, alignment, mounting bolts, limit switches |
rod score / side-load evidence → repair |
|
Monthly |
oil level, breather, electrical terminals, current draw |
level below sight → top up + investigate leak |
|
Every 6 months |
oil condition, filter if fitted, valve operation, thrust hold test |
milky / dark / gritty oil → change |
|
Annually |
pressure/relief set-point check, insulation, seal condition |
hard/cracked seal or thrust drift → replace |
|
Every 2–3 years |
full seal kit, rod & bore inspection, pump wear check |
see hard limits in §8 |
