Tools & consumables
- Metric socket set & ratchet (8–19 mm typical), extensions, swivel
- Torque wrench (range to 0–150 Nm)
- Combination wrenches (metric)
- Flat & Phillips screwdrivers
- Pliers, hose clamps, snap-ring pliers (if applicable)
- O‑ring / seal pick set
- Clean rags, shop towels
- Drain pan (hydraulic fluid capacity for small volume)
- Hydraulic fluid (type specified in operator/service manual)
- Replacement hydraulic filter (recommended)
- OEM replacement shift solenoid(s) for SGK6/SDK6/SDK8 + O‑ring/seal kit
- Multimeter (DC volts & resistance)
- Diagnostic scanner capable of reading/clearing transmission/hydraulic ECU codes (or OEM Toyota service tool)
- Hydraulic line caps/plugs
- Parts cleaner (spray), light grease or hydraulic oil for O‑rings
- Safety equipment: eye protection, gloves, steel‑toe boots

Safety & prep (must do)
1. Park on level ground, lower bucket/attachments to ground, turn engine off, set parking brake, remove ignition key.
2. Block wheels; secure machine against movement.
3. Disconnect negative battery terminal to prevent electrical accidents.
4. Wear eye protection & gloves. Have absorbent pads ready for spills.
5. Relieve hydraulic pressure: follow service manual. If no manual: with engine running, cycle controls to neutral, shut engine off, then slowly loosen a hydraulic test port/fitting at a low‑pressure location while catching fluid (expect pressurized fluid). Use rags, stand clear of spray. Cap/plug lines immediately.

Diagnosis (before removal)
- Scan for fault codes and record them. This can tell which solenoid (by circuit/number) is faulty.
- Backprobe the connector and use multimeter to: a) check harness voltage at connector with key ON (should get battery or switched supply per manual), b) measure solenoid coil resistance per manual. If coil is open/shorted or harness has no supply, repair wiring first.
- If multiple faults, note them and inspect connectors for corrosion/damage.

Step‑by‑step replacement
1. Access:
- Remove engine/top/side panels to reach the transmission/valve body area where shift solenoid(s) mount. On SGK/SDK loaders the solenoids are mounted on the transmission valve assembly—locate per manual or trace harness from ECU.
- Clean surrounding area thoroughly with parts cleaner; seal surfaces must be clean to avoid contamination.

2. Isolate & protect:
- Cap or plug any open hydraulic ports to prevent contamination and fluid loss.
- Place drain pan under work area.

3. Disconnect electrical connector:
- Release locking tab, pull connector straight off. Inspect connector pins for corrosion or bent pins. Clean if needed.

4. Remove solenoid:
- Remove retaining bolts (socket/wrench). Keep track of bolt length/position.
- Pull solenoid straight out. Some are threaded into body; others slide out. If stuck, gently twist back and forth—do not pry on the housing that could damage valve body.
- Remove old O‑rings/seals with O‑ring pick. Do not scratch bore surfaces.

5. Inspect:
- Inspect bore and surrounding valve body for scoring, debris, contamination.
- If debris found, clean with parts cleaner and compressed air (low pressure).
- Replace hydraulic filter and consider draining & changing fluid if contamination suspected.

6. Prepare new solenoid:
- Compare new solenoid to old to confirm correct part.
- Lightly coat new O‑rings with hydraulic oil/grease and install new O‑rings. Never use petroleum grease (use hydraulic fluid compatible lubricant).
- Ensure orientation matches original.

7. Install:
- Insert solenoid straight into bore until seated.
- Secure with retaining bolts. Tighten hand‑tight, then torque to manufacturer specification. If unknown, verify in manual; typical small solenoid bolts are low torque (approx. 8–25 Nm depending on bolt size). Use torque wrench—do NOT over‑torque.

8. Reconnect:
- Reconnect electrical connector; apply dielectric grease to contacts if available.
- Remove any hydraulic caps/plugs; ensure no debris fell into ports.
- Reinstall panels removed earlier.

9. Refill / prime:
- Replace hydraulic filter and refill fluid to correct level with correct type.
- Reconnect battery negative terminal.

10. Bleed/prime system & test:
- Start engine; let idle. Cycle controls out and in slowly to purge air; operate drive/shift functions per manual to re‑seat valves.
- Monitor fluid level and top off as required.
- Use diagnostic scanner to command/cycle the solenoid (if supported) and monitor for errors.
- Check for leaks at solenoid area and electrical connector.
- Road/test the loader under light load to confirm correct shifting behavior.
- Re‑scan and clear codes; verify no new codes.

How each tool is used (quick)
- Socket/ratchet/wrenches: remove/install solenoid mounting bolts and panels.
- Torque wrench: final tightening to specified torque to prevent leaks or stripped threads.
- Multimeter: verify supply voltage at connector and measure coil resistance.
- Diagnostic scanner: read/clear codes and command solenoid for bench testing.
- O‑ring pick: remove old seals without damaging bore.
- Hydraulic caps: prevent contamination while lines open.
- Drain pan/parts cleaner: catch and clean spilled fluid; avoid introducing debris.

Replacement parts required
- OEM shift solenoid(s) specific to SGK6/SDK6/SDK8 (order exact part number from dealer or parts catalog)
- O‑ring/seal kit for solenoid (always replace seals)
- Hydraulic filter (recommended)
- Hydraulic fluid (correct spec & quantity)
- Optional: dielectric grease, replacement connector/pins if corroded

Common pitfalls & how to avoid them
- Not relieving system pressure: leads to fluid spray and injury. Always relieve pressure safely.
- Contaminating valve body: dirt or metal shavings will ruin valves—clean thoroughly and cap open ports.
- Reusing old O‑rings: causes leaks—always fit new O‑rings and lubricate them before installation.
- Over‑torquing bolts: strips threads or cracks housing—use torque wrench and spec.
- Damaged wiring/connectors: symptoms persist after replacement. Inspect/repair harness and clean connectors.
- Installing wrong solenoid/orientation: compare new vs old before fitting.
- Not replacing filter/dirty fluid: new solenoid will fail if system contaminated—change filter and fluid if contamination suspected.
- Skipping diagnostic checks: don’t just install part—verify coil resistance and supply voltage before replacement to avoid replacing a good solenoid for an electrical or control issue.

Final checks
- No leaks, correct fluid level, no fault codes.
- Loader shifts smoothly through all ranges under light load.
- Re‑torque mounting hardware after initial run if service manual specifies a re‑check interval.

End.
rteeqp73

Toyota SDK6 please subscribe. more videos to come.

Toyota SDK6 please subscribe. more videos to come.

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