This excerpt from the user's manual can explain the problem of your hinge.
"... Enamel surfaces must be washed with water and mild detergent. When using the spray cleaner, make sure that the detergent does not get into the heater or sensor of the thermostat of the WHIRLPOOL AKZM 767/NB oven or any door or hinge safety device. Do not use the cleaner to scour the oven, such as steel wire and detergents containing acids, as these may damage the enamel surface of the oven and oven door glass...."
WHIRLPOOL AKZM767WH, AKZM767NB, AKZM767IX, AKZM 767/NB, AKZM 767/WH, AKZM 767/IX
Manufacturer's part price is £10.82 Discount for bulk (starting at 10 units), £10.47 per unit
This manufacturer part is recomended by WHIRLPOOL, which gives it a 10/10 rating.
This spare part is recommended for your WHIRLPOOL AKZM 767/NB oven .
All spare parts are new and come with a 1 year warranty
① Carefully check your WHIRLPOOL oven's product number
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