Really

The IMF has $680 billion set aside for assistance to middle to high income countries. Really. Subtract the Greek pledge and the number reduces by half. The US claims the reserves are sufficient for IMF's real mission which is helping those developing or undeveloped countries that can't help themselves or whose leaders are helping themselves to the public till.

The Chinese claim that the US is mistaken because the US view requires a doubling of quotas, margin call, by member countries to meet the old mission, new mission, and serial defaults expected in lesser tiers of European harmony. The quota increase requires the assent of the 114 member parliaments, of which 40 have been obtained, which provides Republicans in the US marvellous political fodder against.

An aside, presume that US and European GDP growth declines by 3% then the Chinese would be required to increase spending by 18% to pick up the slack and, presumably, the Chinese are politely telling the IMF to take a long walk of a short pier.

For a moment consider not helping those that should not need the help, let the Greeks default and private lenders accept the consequence of the lending decision, double quotas, and direct the aid toward, say, Sub Saharan Africa instead of recycling interest payments to preserve worthless collateral on balance sheets of developed countries banks.