Description

PAT DS 350 2003 Operators Manual – Grove AT422T Load Moment Indicator

I’ll tell you straight – if you’re running a Grove AT422T with a PAT DS 350 load moment indicator and you don’t have the factory PAT DS 350 2003 Operators Manual on the seat next to you, you’re flying blind. Seen too many guys guess at LMI settings and end up with a tipped crane, or worse, a boom in the dirt. This manual is the real deal – OEM print from PAT, revision H dated 06/09/03, covering the DS 350 / 1328 Graphic for the AT422T. 120 pages of specs and procedures that came out of the engineering department, not some third-party copy shop.

I’ve torqued head bolts on heavy equipment for 28 years, and I know the difference between a manual that tells you the truth and one that tells you what somebody thinks is close enough. This one’s got the original PAT part number 031-300-190-036 and the Grove number 9-333-103515. If you’ve ever wondered why your LMI reads 79.4° boom angle when you know it should be 80°, it’s because the calibration procedure on page 29 wasn’t followed. This manual gives you that procedure.

General Information and Warnings (Pages 1-2)

Section 1 is general info – what the DS 350 does, the system overview. Section 2, the warnings, is where most people stop reading. Don’t. PAT put the critical safety limits in that section, and if you skip it you’re ignoring the manufacturer’s own advice. Cranes kill people. This manual doesn’t mince words about anti-two block setups or load moment limits.

System Description and Control Identification (Pages 3-10)

Pages 3 through 10 show you exactly what each button on the operating console does. The CTRL, SEL, LIM, FARE keys – it’s all there. I’ve seen operators hit the wrong key during a lift and dump the load because they thought they were setting the boom angle limit but were actually changing the reeving. Section 3.3 labels every control. Use it. Memorize it. Then you won’t be that guy.

Configuration Setup: LMI Setup, Hoist Line, Reeving, A2B (Pages 11-17)

This is where the manual earns its keep. Section 4 walks you through the LMI setup procedure – step by step, no guesswork. Quick hoist line selection on page 15, quick setting the reeving on page 16, anti-two block switch configuration on page 17. If you’re swapping a hoist line or changing the reeving, you need the specific sequence from this manual. Aftermarket manuals leave out the keying order – this one doesn’t.

Operation and LIMIT Setting (Pages 18-28)

Section 5 covers LIMIT setting: tip height, boom angle, radius limitations. Page 21 shows the tip height limit procedure. Page 22 shows boom angle limitation. Page 24 shows radius limitation. Also info crane configuration on page 26 and display contrast control on page 27. If you’re working in a tight radius with a load near the max, these limits are the difference between a safe lift and an OSHA report.

Pre-Operation Inspection and Calibration Verification (Page 29)

Section 6 is short – one page – but don’t underestimate it. This is the pre-op check that the factory says you must do before every lift. Calibration verification means checking that the LMI reading matches the actual load. If it’s off by 5%, you’re in trouble. The manual tells you which sensor to check and how to zero the system.

Error Codes (Pages 33-120)

Section 8 gives you the complete error code list. When the DS 350 throws a code, you need to know what it means and what to do. Aftermarket manuals paste a generic cross-reference. This one has the PAT-specific diagnostic steps. I’ve used it to trace a faulty A2B switch on an AT422T in twenty minutes – would have taken half a day guessing.

One more thing about source validity. I check every manual I sell against the OEM part numbers. This is the PAT 031-300-190-036 / Grove 9-333-103515. If you find a cheaper PDF online, it’s probably a scan missing pages or a third-party reprint that skips critical details like the anti-two block calibration. Don’t risk your rig on a questionable copy.

Who Needs This Manual?

You’re a crane operator, a fleet mechanic, or an owner-operator running a Grove AT422T. Maybe you bought a used crane and the manual got lost somewhere between the sale and the first job. Maybe you’re a shop tech who gets called out when the LMI acts up. Either way, this 120-page factory manual is your guide. It’s also useful if you’re a DIY heavy-equipment enthusiast who wants to understand how load moment indicators work – but don’t use a manual like this without proper training. Crane safety is not a hobby.

Related manuals you might need: PAT iFLEX5 DS 350 2003 Operators Manual”>PAT iFLEX5 DS 350 2003 Operators Manual for the iFLEX5 variant, or the PAT DS 350 IFLEX5 2003 Service Manual”>PAT DS 350 IFLEX5 2003 Service Manual for deeper diagnostics. Also check the PAT DS 350 1307 Operators Manual”>PAT DS 350 1307 Operators Manual if your crane uses the 1307 console. For general understanding of transmission systems (not this manual), see Manual Transmission”>this article on Manual Transmission and Manual Transmission”>another reference on Manual Transmission.

Frequently Asked Questions

Does this manual cover the entire DS 350 system for the Grove AT422T?

Yes. It covers the DS 350 / 1328 Graphic LMI specifically for the Grove AT422T crane. Includes all setup, calibration, operation, and error codes. 120 pages of factory data.

Are the torque specs included for sensor mounting bolts?

No – this is an operator’s manual, not a service manual. For torque values on sensor brackets or wiring connections, you need the service manual. But the calibration verification procedure on page 29 does specify load cell zeroing steps.

What is the revision date of this manual?

Revision H dated 06/09/03. PAT part 031-300-190-036, Grove part 9-333-103515. This is the latest OEM version for the DS 350 on the AT422T.

Can I use this manual for a different crane model?

No. The DS 350 has different configurations depending on the crane. Using this manual on a non-AT422T will give incorrect LMI parameters and could cause a lift failure. Always use the manual matched to your crane’s serial number.

Look – I’ve seen what happens when a crane operator tries to “save time” by skipping the LMI setup procedure. Bent booms, dropped loads, serious injury. The factory manual is cheap insurance. Access the Factory Manual and keep it in the cab. Read it before you run the hoist. That’s not a suggestion – it’s the standard.