Hyundai — Regulator disassembly
Repair & overhaul
From a Hyundai service manual — check it applies to your exact model before use.
Before you start
- Do not loosen cover(C) adjusting screws and nuts. If loosened, adjusted pressure-flow setting will vary.
- When removing snap ring(814), return spring(654) may pop out. Take care not to lose it.
- Take care not to lose O-ring.
Procedure
- Since regulator consists of small precision finished parts, replacement of regulator assembly is recommended unless special reason.
- Choose clean place. Spread rubber sheet or cloth on workbench.
- Remove dust, rust from surfaces of regulator with clean oil.
- Remove hexagon socket head screw(412,413) and remove regulator main body from pump main body.
- Remove hexagon socket head screw(438) and remove cover(C,629).
- After removing cover(C,629) subassembly, take out outer spring(625), inner spring(626) and spring seat(C,624).
- Draw out adjusting ring(Q,645), pilot spring(646) and spring seat(644) from pilot section.
- Remove hexagon socket head screws(436,438) and remove pilot cover(641).
- Remove snap ring(814) and take out spring seat(653), return spring(654) and sleeve(651).
- Remove locking ring(858) and take out fulcrum plug(614) and adjusting plug(615).
- Remove lever(2,613). Do not draw out pin(875).
- Draw out pin(874) and remove feedback lever(611).
- Remove lever(1,612). Do not draw out pin(875).
- Draw out pilot piston(643) and spool(652).
- Draw out piston case(622), compensating piston(621) and compensating rod(623).
Tools required
- Adjustable angle wrench Amazon
- screw driver Amazon
- hammer Amazon
- pliers Amazon
- steel bar Amazon
- torque wrench Amazon
- pincers Amazon
- M4 bolt Amazon
- M6 bolt Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Use M6 bolt to take out fulcrum plug and adjusting plug
- Use M4 bolt to draw out adjusting ring(Q,645)
- Pin(874) is 4mm in dia.
Source: Hyundai service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.