Delta single handle ball valve faucets are among the least troublesome to repair although the fact the valve is spring loaded can make disassembly a little finicky.
Delta arabella kitchen faucet leaking.
Replace the hose if it is damaged or leaking.
Replace stem unit assembly 3 in diagram repair part rp1740 leaks from base of the spout.
For faucets purchased prior to 2007 please order rp1050 cap and rp61 cam and packing.
Replace seats and springs 4 in diagram repair part rp4993 if leak persists.
Over the valve seat and spring the stem is held into the body with a bonnet nut.
When one of these faucets.
Replace ball assembly 1 in diagram repair part rp70 as shown for lever handles or rp212 for knob handles replace cam packing 2 in diagram repair kit rp61.
The handle then fits onto the top of the stem.
Replace stem unit assembly 3 in diagram repair part rp1740.
If this connection is secure and not leaking then check the hose for damage.
With a stem style faucet a neoprone valve seat and spring fits into the water inlet port in valve body.
Leaks in this type of faucet usually can be fixed with a new neoprene valve seat and spring.
Since the water travels through the hose and not the spout itself a leak from the base of the spout would be very unlikely.
Replace o rings 1 in diagram repair part rp2055 leaks from aerator.