Description

PAT America DS350, TMS 870, TTS 870 2001 Troubleshooting Manual

If you are wrenching on a Grove crane with a PAT America DS350, TMS 870, TTS 870 2001 Troubleshooting Manual in hand, you already know the cost of guessing on boom control electronics. This is not a generic aftermarket PDF – it’s the factory document PAT America issued for the DS350 modular boom control extension on the Grove TMS 870 and TTS 870. 57 pages of fault trees, wiring schematics, and sensor adjustment procedures that stop you from replacing parts you don’t need. Crane downtime burns money and safety margins, so this manual exists to get you to the right fix fast.

Troubleshooting the Boom Length Percentage Problem

Section 3 on page 6 walks through the Boom length percentage problem. The console shows a number that doesn’t match the actual boom extension? That’s usually the length transducer or a bus error. The manual gives you a step tree: check the inner mid and center mid transducers, then the angle transducer on overall boom length. Each step references specific wiring diagrams later in the book. You don’t guess – you test, then replace. The adjustment procedure for the length transducers (page 39) includes proximity switch locations and air gap specs. Those gaps matter. A few thousandths off and the controller thinks the fly section is still inside the mid section.

E83 Error: Outer Mid and Fly Section Not Retracting

Chapter 5 (page 26) covers error code E83. This is a common headache on the TMS/TTS 870 – the outer mid and fly section won’t retract in auto mode. The manual isolates it to the bus extension circuit first, then checks the relay output logic for the two-way valves (section 22). The wiring diagram for the boom section (page 52) shows exactly which pins to probe for continuity. I have seen techs replace entire boom control boxes because they didn’t run through these steps. Don’t be that guy. Follow the tree, check the proximity switches, verify the solenoid outputs. The OEM spec for the proximity switch air gap is in the manual – you will not find that in a third-party summary.

Proximity Switch Location and Adjustment

Section 8 on page 39 dedicates two pages to the proximity switches – where they are physically mounted on the boom sections and how to adjust them without pulling the whole assembly apart. These switches are what tell the DS350 controller which section has extended. Wrong gap and you get that Boom out of sequence in auto mode fault described in section 4. The manual gives you the exact feeler gauge thickness and the lock-torque for the mounting screws. No aftermarket manual will give you that because they never measured the original hardware.

Electric Wiring: Central Unit, Bus Extension, Turntable, Boom, Lower

Five separate wiring chapters (sections 16 through 20) break down the entire harness by physical location. The central unit wiring (section 16) covers the main controller pins. If you need to verify that the bus extension is getting power, section 17 shows the connector layout for the CAN bus. The turntable wiring (section 18) is critical on the TMS 870 because the slip ring assembly can develop intermittent breaks. The manual pages are laid out like a harness routing drawing – not just a schematic. Component locations are labeled with real part numbers. Need the charge pressure? Not in this manual – this is troubleshooting only – but you will find the signal flow for the pressure sensor on the lower wiring page (section 19).

Why Factory Specs Matter on a PAT America System

PAT America produced these machines to a closed standard. The bus protocol, the transducer resistance ranges, the relay logic – all proprietary. A generic wiring diagram from 2008 will send you into a dead end. This manual includes the OEM part numbers for the console display (section 21) and the relay output logic for two-way valves (section 22). You can actually bench test the valve solenoids using the resistance values listed. No guesswork. The manual’s Notice page says the information is subject to change, but for a 2001 system this revision B document is as close as you get to the production line.

Pair this troubleshooting manual with the PAT America DS 350, 1334 2002 Operators Manual – Factory Specs for daily operation checks, or the earlier PAT America DS 350, 1334 2001 Operators Manual – OEM Specs if you need the pre-2002 revision. If your crane is a different model, the PAT DS350 MODULAR Boom Control RT865 BXL Manual covers that variant.

Understanding this manual is like understanding a Manual Transmission – you need to follow a sequence. The wiring diagrams are laid out logically. If you can rebuild a Manual Transmission, you can trace a fault through these schematics. Just take your time with the relay logic table on page 54 – that table shows which solenoid outputs fire for each boom extension command.

Crane work is dangerous. This manual is your safety belt.

FAQ

Does this manual cover the TMS 870 and TTS 870 models?

Yes – the covers says “FOR GROVE CRANE TMS/TTS 870”. Both models use the same DS350 boom control extension.

How many pages is the troubleshooting manual?

57 pages, including the table of contents, wiring diagrams, and relay logic table. It is not a service manual – troubleshooting only.

Can I use this manual to adjust the length transducer on the DS350?

Section 12 covers the length angle transducer for overall boom length, and section 13 is specifically titled “LENGTH TRANSDUCER ADJUSTMENT”. It gives the physical adjustment procedure and the expected resistance range at the transducer connector. The proximity switch adjustment in section 8 ties into this – if the transducers are offset, the controller will not compute correct boom length. The manual also refers to page 39 for the air gap spec on the fly section proximity switch. Following these steps will get your boom length percentage back to factory accuracy.

Is this the same as an operator’s manual?

No. An operator’s manual covers daily operation, load charts, and safety decals. This troubleshooting manual is meant for technicians diagnosing faults in the boom control system. Do not use it for routine crane operation.

Access the Factory Manual from AutoRepairManuals – the largest collection of OEM shop manuals in North America. 57 pages, factory sealed, no reprints. Your boom will thank you.