RIDGID GP90135 manual Troubleshooting, Be sure that the old head, Gasket is replaced with a

Troubleshooting

!WARNING

For your own safety do not try and run the air compressor while troubleshooting.

TROUBLE	PROBABLE CAUSE		REMEDY
Low discharge pres-	1. Air leaks	1. Listen for escaping air.
sure			Apply soap solution to all
			fittings and connections.
			Bubbles will appear at
			points of leakage. Tighten
			or replace leaking fittings
			or connections
	2. Leaking valves	2. Remove head and inspect
			for valve breakage, weak
			valves, scored valve seats,
			etc. Replace defective
			parts and reassemble
			! CAUTION
		Be sure that the old head
		gasket is replaced with a
		new one each time the
		head is removed
	3. Restricted air intake	3. Clean the air filter element
	4. Slipping belts	4. Loosen engine clamping
			bolts and move the engine
			in a direction away from
			the compressor, being sure
			that the engine pulley is
			perfectly aligned with the
			flywheel. Tighten engine
			clamping bolts. The belt
			should deflect about 1/2”
			under 5-lbs of force. Do
			not “roll” belts over pulleys
	5. Blown gaskets	5. Replace any gaskets
			proven faulty on inspection
	6. Low compression	6. Low pressure can be due
			to worn rings and cylinder
			walls. Correction is made
			by replacing the rings,
			cylinders, and pistons as
			required

TROUBLE	PROBABLE CAUSE	REMEDY
Overheating	1. Poor ventilation	1. Relocate the compressor
		to an area where an ample
		supply of cool, clean, dry
		and well-circulated air is
		available
	2. Dirty cooling surfaces	2. Clean the cooling surfaces
		of pump and motor/engine
Excessive belt wear	1. Pulley out of alignment	1. Realign engine pulley with
		compressor pulley
	2. Belt too loose or too tight	2. Adjust tension (See Drive
		Belt Section)
	3. Belt slipping	3. Adjust tension or replace
		belt (See Drive Belt
		Section)
	4. Pulley wobbles	4. Check for worn crankshaft,
		keyway or pulley bore
		resulting from running the
		compressor or motor with
		loose pulleys. Check for
		bent pulleys or bent crank-
		shaft
Unit stalls	1. Low engine idle	1. Increase idle, refer to
		engine manual for details
	2. Improper lubrication	2. See LUBRICATION, under
		Assembly
	3. Low oil level	3. Check oil level. Fill if nec-
		essary
	4. Defective unloader valve	4. Replace
Excessive noise	1. Loose engine or com-	1. Loose engine or compres-
(knocking)	pressor pulley	sor pulleys are a very com-
		mon cause of compressors
		knocking. Tighten pulley
		clamp bolts and set-screws
	2. Lack of oil in crankcase	2. Check for proper oil level; if
		low, check for possible
		damage to bearings. Dirty
		oil can cause excessive
		wear
	3. Worn connecting rod	3. Replace connecting rod
	4. Worn piston pin bushing	4. Remove piston assemblies
		from the compressor and
		inspect for excess wear.
		Replace excessively worn
		piston pin or pistons, as
		required

16 17