Lexus RX (RX 350L, RX450h) 2016-2026 Repair Manual: Precaution

• Before disassembly, clean the outside of the differential assembly and remove any sand or mud to prevent it from entering the inside of the assembly during disassembly and installation.
• When removing an installed part made of light alloy such as the differential side bearing retainer, tap it off with a brass bar and a hammer. Do not attempt to pry it off with a screwdriver.
• Always arrange disassembled parts in order and protect them from dust.
• Before installation, thoroughly clean and dry each part and then apply Toyota Genuine Differential gear oil LT SAE 75W-85 GL-5 or equivalent to them. Do not use alkaline cleaner for aluminum or rubber parts and rear differential case bolts. Also, do not clean rubber parts such as oil seals with non-residue solvent.
• Coat sliding surfaces and rotating parts with Toyota Genuine Differential gear oil LT SAE 75W-85 GL-5 or equivalent.
• When holding a part in a vise, be sure to place aluminum plates between the part and vise. Do not put it directly in the vise.
• Always replace non-reusable parts with new ones.
• Do not damage the sealing surfaces of the case. Such damage may cause oil leakage.
• Before applying seal packing, completely remove any old seal packing remaining on the components using a non-residue solvent.
• Do not add oil within 1 hour or allow rapid acceleration or deceleration within 12 hours of installing sealed parts.
• Damage to surfaces in contact with an oil seal or gasket may cause oil leakage.
• When press-fitting an oil seal, do not damage the oil seal lip or outside periphery.
• When replacing a bearing, replace the inner and outer races as a set.
• When replacing a bearing, do not apply force to the roller or retainer.
• When replacing a hypoid gear, replace the ring gear and drive pinion as a set.
• New bearings are coated with anti-rust oil. If using new bearings, do not wash it off.
• If the threads or contact surface of a bolt is excessively rusty, replace the bolt.

Differential System

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Problem Symptoms Table

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