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Autopapyrus · Geely Monjaro (1st generation)
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Compiled automatically from service literature and owner experience. Specs are for the typical configuration — check them against your exact car before you start.

Geely Monjaro (1st generation): Automatic Transmission Fluid Exchange (Machine Method)

The Monjaro uses an 8-speed Aisin automatic transmission with a torque converter. The fluid is filled for life, but under severe-duty conditions it is changed about every 60-80 thousand km (37,000-50,000 miles). A machine exchange replaces almost all of the fluid, including the fluid in the torque converter and cooler. The manufacturer specifies the exact capacities, specification and interval in the maintenance schedule. For this transmission they are not documented in open sources, so the general principle is described below.

Difficulty: Hard Time: 2-3 hours Steps: 11 Tools: Transmission fluid exchange machine with adapters for the cooler lines (or a shop-grade fluid exchanger), lift or inspection pit, socket set and hex bit set, torque wrench, scan tool or thermometer for monitoring fluid temperature, drain pan, syringe or pump for refilling, new drain and fill/check plug sealing rings

Parts

2
  • 🔩 Automatic transmission fluid for the 8-speed Aisin automatic (type, specification and capacity are listed in the owner's manual). For a machine exchange, have 1.5-2 times the capacity of your version on hand, usually 12-18 L (12.7-19.0 qt). Drain plug sealing ring and fill/check plug sealing ring, if they are replaceable on your car. If you are replacing the pan filter, buy it as a kit with the gasket
  • 🔩 part name: automatic transmission filter with pan gasket

Step by step

11 steps
  1. Park the car on a lift or over a pit on level ground. Remove the engine undershield if it blocks access to the transmission pan.
  2. Warm up the transmission with a short drive. Monitor the fluid temperature with a scan tool. Filling and checking the level must be done within the temperature window set by the manufacturer, usually around 35-45 °C (95-113 °F). Check the exact window against the maintenance schedule for your car.
  3. Drain the old fluid through the pan drain hole. Note how much comes out. Inspect the fluid and the magnet on the plug. A thin gray film is normal, but large metal shavings or a burnt smell mean problems inside the transmission. In that case, do not do a machine exchange; have the transmission diagnosed instead.
  4. Close the drain hole with a new sealing ring. Take the tightening torque from the maintenance schedule. If no data is available, a rough guide for similar plugs is 20-30 N·m (15-22 lb-ft). Do not overtighten, because the pan is aluminum.
  5. Locate the transmission cooler hoses running to the radiator. Disconnect the return hose and connect it to the machine according to the machine's diagram. Connect the supply line as described in its instructions.
  6. Start the engine in P (park) and turn on the machine. It pumps the old fluid out of the circuit and delivers fresh fluid. Keep exchanging fluid until the color of the fluid coming out matches that of fresh fluid. This is usually 1.5-2 times the transmission capacity. Make sure the level in the transmission neither drops nor rises above the normal range.
  7. During the flush, with the engine idling, move the selector through all positions in turn (P, R, N, D), holding each for 3-5 seconds. This way the fluid passes through all the clutches and the valve body.
  8. Stop the machine, shut off the engine, reconnect the hoses in the standard way and tighten the clamps. Check the hoses for leaks.
  9. If you are replacing the filter, remove the pan, then replace the filter and gasket. Tighten the pan bolts in a crisscross pattern in 2-3 passes to the torque from the maintenance schedule. Then repeat the filling and level check.
  10. Check the level using the manufacturer's procedure. Most often this means: transmission warmed up (temperature within the window), engine running, selector cycled through all positions, and fluid at the level of the check hole or a thin stream slightly dripping out. Adjust the level to normal.
  11. Install the engine undershield, then take a test drive of 10-15 km (6-9 miles). Check for smooth shifting and the absence of jerks or clunks when engaging D and R, then inspect the pan and hoses for leaks.

Common mistakes and warnings

  • The transmission is filled with a special fluid with a strict specification. Fluid of the wrong type causes jerking, slipping and damage to the valve body. Do not use universal fluids that lack the required specification. Do not do a machine exchange on a transmission showing signs of wear, metal shavings in the fluid or slipping. Fresh fluid can make the situation worse. If you have no experience with fluid exchange equipment and temperature monitoring, leave the job to a repair shop. A mistake in the fluid level or fill temperature can quickly destroy an expensive transmission. The Haldex coupling on AWD versions and the rear differential are serviced separately and are not part of this procedure.
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